Russia is already very large and sparsely populated. They don't want more territory. What they want is to not be surrounded by enemies, which is why the current war is happening: basically try to force a regime change after the USA did their regime change a few years ago.

USA could not defeat afghanistan so I doubt it intimidates anyone really… if we are talking conventional warfare.

Anyway despite all of Trump's bullshit talking points, USA will do as always militarily, because it's convenient to them that EU doesn't become independent.