They had 700 tanks in decent shape in storage in about July. However tanks will be in factories being refurbished and obviously a lot more tanks are on the front line. That are very likely a few thousand tanks.
So they probably will start to have problems replacing losses soonish. They might buy some from North Korea or Iran though.
Even a Trump victory would not mean an end of the fighting though. Europe is supplying more weapons then the US and Ukraine also has arms production. So no overruning Ukraine.
$7trillion is three times the GDP if Brazil. It is bigger then the US federal budget. Seriously it is insane.