My dear countrymen what does it take or where we are lacking to shoot down GEO sats ?
Pretty much everything to work perfectly fine.
Remember the analogy they gave while we placed MoM on Mars orbiter? Hitting a golf ball across the ocean and into the hole....! This is bigger than that.
LEO takes a huge amount of fuel to be burnt at a very predictable rate, producing very accurate rate of acceleration. This is extremely important as the LEO birds are whizzing past overhead at nearly 8 Km/s. (Try doing that in your car...!). A slight over or under burn of the propellants and the bird is few dozen KM away.
The same is the case with the control systems. Those fins on the bottom of the projectile has to respond to a command in a fixed amount of time, say 0.01 milliseconds... A discrepancy of 0.001sec will put the entire rocket at a distance disadvantage. Same is the story for guidance.
But this is for LEO. GEO is just a matter of time. The orbits here starts from 38,000Km... LEO's max altitude is 2000Km. All that worked for LEO also has to work for GEO... But now we have a massive weight disadvantage. The weight of the fuel. That's it. Solve this problem and you have got your GEO A-Sat weapon or Anti Alien weapon....