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Well the US army is under 500k whereas the Russian army on one of their borders has just under 1M men. Their army is currently larger than the US army by quite a bit. Does the US have equipment and manpower to (if this article is accurate) triple the size of their army in less than a year? Probably... Lol... It is however a massive undertaking.
Getting soldiers is easy. Giving them warm clothes, good boots and enough to eat is a while different story. >

Amateurs talk tactics, professionals talk logistics. 
People give NATO a lot of shit because 80% of their military forces are non-combat arms but there’s a reason why we can sustain multi-decade major combat ops in Iraq and Afghanistan while Russia can’t supply its troops inside a nation it shares a land boarder with. POG pride baby!