>What percentage of them being combatants
I actually don't know this. But Ukraine is receiving NATO 'lend-lease', NATO intel and money. This is a significant contributing factor to Ukraine's defensive and offensive capabilities.
If Poland recieved the same amount of support, definitely a higher percentage of those 1.5 million troops would of been actual combatants. Russia doesnt have such amount of troops, especially when the situation desperately requires it to completely hold the front.
>USSR joinned earlier.
Alright. You guys are correct on that one. I retract the point on the war on two fronts.