If this turns into a full blown war you will need ten million men to fight. Russia can do this
You will need two hundred thousand battle experienced men to train them. Russia has this
you will need factories to uniform and fit them out with standard gear. And the people working in the factories experienced enough to whip it up quickly. After two years Russia now has this
You will also need the factories ready to go with trained workers to make copious amounts of ammunition and equipment. Russia has had two years to train workers to get production running smoothly.