Well frinds now lets talk about two way war which is the main issue of this thread.
There are 4 possibilities
1. India attacks both china & pakistan
2. India attacks china but later on pakistan joins with china
3. india attack pakistan and china comes forwarn to help pak.
4. Both china & pak attacks india
case 1. we must be living in a fools paradise to even dream such a thing.
case 2. chances are very less very yes possible on issues like brahmaputra dam.
case 3. most likely case in
case 4. again very less possible as that will bring a huge international bashing of chinese vintage forces and their funny number game will soon be striped under the day light.
Now to understand the situation better we must remember that before we get the answar to the question raised in this thread we should be able to identify the level of military confrontation that we are talking about. Is it just a limited war ? or a midium size lasting for a couple of month ? or fighting till the last drop of blood?
As all the countries under consideration are nuke capable limited war is the most likely case.
The points that we will have to remember to analize the situation properly could be listed as follows.
1. currently india holds a overwhilming superiority over pakistani air force and this gape will widen exponentially with the time.
2. infantry and mechanised forces are extreamly vulnarable to air attacks.
3. even after the induction of agostas pakistan has just 0% chance to break free an Indian naval blockade.
4. the topography of sino indian border dosnt allow a very large and heavy mechanised confrontation.Not even a very high density of personal deployment is possible.
5. chinese conventional subs dosnt hv the capability to reach indian ocean.
6. Even now indian navy holds a upper hand in overall fire power over chinese counter part thanks to brahmos which has a greater range and accuracy than chinse yakhont.
7. keeping point 6 in mind its unlikely that chinese nuke subs will come in to help pakistan to break free of indian blockade with an escorting fleet of chinese destroyers and frigates.Isolated noisy chinese ssgns will be under extream threat.
8. Inspite of overall chinese suprimacy IAF dose hold some key advantages over chinese counterpart. With atleast 40 brand new Su 30 mki and even if it is just 1 phalcon will be a massive danger to any chinese flying fancy.
9. T-90S are far better than anything that pakistan has. Even repost says china will have to take immidiate measure to upgrade its tank force to counter india otherwise by 2020 IA will field the most powerful mechanized force in asia.
10. China has a huge stock pile of different types of missles which will be of immense threat to indian military and civil assets.
11. A few brahmos with very less range will counter chinese missile threat not to great extent. So lets not brag about it.
12. China has a far better military satelite infrastructure.
13. even today indian mig 21 bisons are better than most of the pakistani fighters leaving
f 16 blk 52 where as f 16 a/b will have a tough time against it. It also posses great threat to pakistani invading talk force.
14. No cross country mobile air to air capability is available with pakistan.. most likely not even with china as akash is the only of its kind as of now in the world.
15. Night vision capability of both IAF and IA is far superior to anything that pakistan can field. thanx to israel. though T 90S night vision continues to trouble.
16. india has huge anti armour stock pile which can be very dengerous for pakistani t 80s and al khalids
well these are the technicals on which indian offensive will be revolving around. Suppose india attacks pakistan on account of another 26/11 and china joins in. In this new picture india will certainly barr itself from any further penetrating adventure into pakistani soil and their main objective will be to contain them and maintain the sanctity of the border. A floke of 100 indian birds with gud BVR along with robast indian air defence ( may be old according to world standered but mirage III, chinese mig 21 copy that was sold to pak, f 16 a/b are no state of the art stuff for that matter. existing SAMS can very welll take care of pakistani air force. which has jets those are much older than indian old but upgraded SAMs.)
will be enough to prevent any pakistani air or land incursion. especially with around 4 lac infantry with anti armour devices with less but effective air support looming large at the border. A naval blokade will drmatically bring down the pakistani endurance to no more than 15 days at the most.Indian UAVs will play a very very vital role in this containment role by providing partial early warning support. Israeli UAVs along with 25 to 35 brahmos will leave the forward marching pakistani force high and dry with all the supply line smashed.With large scale serial production of high quality radar devices India has confirmed its advantage over pakistani army long time back. This will expose any malacious adventure of pak forces much earlier and act as a battle field force multiplier. In this tough situation India will be very much dependent on force multiplier as the actual strenght for her forces will not permit her to take on two nuke nations at a time but these force multipliers will give india a virtually much more powerful and much more effective armed force.How ever much pakistan may brag about their achievements in defence but its very hard to believe that a defence budget worth 8 billion will servive against 40 billion for more than 15 days.
Again the main threat from pakistan will be its ballastic missile forces which still seem to have some advantage over india. ( atleast in terms of availability with the armed forces if not about technical knowhow ) here india cant help but take the losses mainly by pakistani SRBM as the longer version will not be used as it will be mistaken as a nuke attack.Again here the very less pakistani stratigic depth will go against it where indian SRBM will take care of most of pak's vital installations where as ghouri will be far away from it.But we can still expect considerable damange of the infrustructure in the border states.Indian navy apart from posing a blockade will launch a smashing attach being completely unchallenged, but will not go very deep as virat currently carry only 11 sea harriers and i am not sure if the 4 new mig 29k can be used on her. So IN might be vulnarable to pak air force with IAF busy on the northen sector with china. Pakistani surface fleet will hide near to the harbour and behind the chain of pak submarines. The only serious threat to IN from pak will not be submarines rather it will be the chinese copy tomahawks, though i am not sure if they could be used in anti ship role ( possibly not and meant for grount attack ). The indian old mig 21 s possibly all will be used against pakistan only. The total number will be around 200 ( including 40 odd bisons) along with 30+ mig 29s and 45 mirages[do remember these mirages were bought by india to counter pak f 16 A/B] ( so this will bring the indian 4th gen fighter strenght to 75 which is still little more than pak 4th gen f 16 A/B as not many f 16 blk 52 will be available..may be around 4/5 . For final superiority india may use 20 odd Su 30 mki. IA will place most of her T 90S and and non upgraded t 72s near the pak bordar while Arjun along with chesis mounted Akash will be accompying t72. Arjuns are likely to be placed in rajasthan as that will be the most threatning posture toward pak. 70 + arjun with akash can crush into pakistani territory and grab land within very short notice to counter any loss of land eles where.
Now comming to Northen border. With china india has no chance to match them force by force so they will not even try that. Rather they will try to hit the pride of china by going into hitech warfare and causing extensive damage. Indian strategy will be assymetic and net centric. Indian airforce will deploy about 90 + su 30 mki , 30 + mig 29s , 60+ mig 21 bisons and its only AWAC phalcon. Best of indian mobile SAMs will be moved toward northern border. Atleast some of the S 300 MLUs are likely to be shifted from the city area and placed nearer the bordar which is not near to the SU 30 mki bases.Indian jets will fly in mix formation. SU 30mki along with mig 21 bisons will form the strike force for IAF whereas some mig 21 bisons with mig 29 under the realm of phalcon will play a defensive role little deeper into indian territory. The areas without a powerful enough airforce umbrella will field the best of indian SAMs like upgraded growlers and pichoras. Some batteries of SU 300 will be scatterdly placed to offer sudden surprizes to invading chinese birds.In avionics ( jammer, radar EW suits , ECM pods etc) india will enjoy some key advantages over the best of chinese techs.
Ideas of Indian side will be to force escalate the tension with china.Slik and smart portion of indian forces will try to inflict serious damage to chinese invadors so as to force them to bring in over powering force into play and thus calling for international involvement. The main offensive of indian armed forces will revolve around phalcon & su 30 mki 's. IA will field its upgraded T- 72 s and BMPs , howtzers , pinaca & smurch .Indian tanks and and BMPs will suffer huge losses to chinese anti armour force, again indian MBRLS with the help of israeli "UAVs will inflict massive destruction to chinese soft infantry tgts.Its unlikely that chinese airforce will try much of adventure as within a limited scale, with about max 100 chinese birds in action over the entire region, will call for havor destruction of their j 10s, j 11s , su mkks. India will try to disrupt the supply lines of the chinese forces by using brahmos and air launched stand off cruise missles. Chinese cruise missiles will cause havoc to indian supply lines , air bases , and other big installation nearer to bordar. Though india has the capability of shooting down a large number of chinese missiles but indian SAM capability will be over powered by the sheer number of chinese missiles. some smurch MBRL's will be caumofledged deep into indian territory to flush out enemy infantry incase of any invasion. Samukya will be deplyoed to cover up the location of key indian strike forces by jamming enemy weapon locating radars. The sanctity of Mcmohan line will again largely depend on Iaf . India will try to escallate the tension along the border by a systematic and and coordinated offensive defence by maximizing attrition to the chinese forces. As per my understanding china will loose much more lives than india whereas india will take serious damage in installations and armoured sections. Both the navies will be put on high alart but with no real confrontation on the ground will take place.
Finally border with china will depend on how effecienty india brings in international involvlement into the game. Either too early or too late international intervention will see India loosing some more land to china whereas pakistan will face serious spanking everywhere even aganst 40% of indian forces, may even end up lossing some land ( overall). whereas china will give india a nice show of its missile prowess and make india cry over the wastage of time. India willl loose about 5k lives with china about 8k. atleast 100 indian tank will be smashed even in limited war. many other installations will be crippled, many air bases will be heavily damaged. may get away with a little loss of land if war is stopped within 1 month.So india should try to capture equivalent amount of land from pakistani soil which could be traded with chinese occupied indian territory after the war is called off.