il-76, C-17, C-5, AN-124 Ruslan and Y-20 carries nearly 70 to 90 tonnes. So we should automatically eliminate other planes like C-2, C-130, A-400M etc.
So what are the options currently we have.
1. Il-76 - (Il-76MD-90A). This is the latest variant from our Russian folks. Currently in production and line will run upto 2028 based on RuAF orders. Purchasing this have some advantage like easy training, MRO facilities are already established. Only downside will be spares availability and also reduced reliability compared to its American counterpart.
2. C-17 Globemaster III - Becomes the workhorse of IAF in the last decade. Unfortunately the production has been ended. Only way to acquire is to buying it from RAF or get some lease from USAF.
3. C-5 Galaxy - Not in production and never exported.
4. AN-124 Ruslan - Another heavy lifter from Antonov. But current state of Antonov is unknown and it takes billions to restart the facility and starts production of this Cold war veteran. Also An-124 production ended in 2004.
5. Y-20 - Comrade Xi will not sell this to enemy nation. So out of bound.
This decade is more oriented towards the launch of Saras -MK1,Saras-MK2, RTA and C-295 in this cargo and passenger aircrafts. Maybe NAL can start study about Strategic Airlifters and from 2030 we will start some activity.
The practical solution is to buy Il-76 modernized or buy 2nd hand C-17 from RAF and USAF.