They need large numbers specifically because Russia is using large numbers. Each round typically destroys only one piece of enemy materiel. Used, it is gone. Ev

They need large numbers specifically because Russia is using large numbers. Each round typically destroys only one piece of enemy materiel. Used, it is gone. Even ideally, it usually takes several shells to destroy a tank or artillery piece, or missiles to sink a ship. If they have more of those than you have rounds, they win even if rounds are, in principle, much cheaper. That is their logic of sending in T72 tanks. Yes, they are easy to take out with the cheapest shoulder-launched missile, if shot from in-range, but until that happens each is a grave threat to life and limb. They are sending in whole trainloads.