No more than America's reaction in 2003 against the invasion of Iraq. And of course it wouldn't have been like the above. You exploit various reasons to enter war. The case for an attack on Russia in 1945 may have been more easily made than for Iraq in 2003. The obvious is the lack of resolve in '45 and what we have been blessed with in a POTUS in '03. Russia did kill tens of millions and enslaved through an ideology hundreds of millions. Some of that still continues. Iraq's past and future intentions were clear. Our President made the tough choice for the "world community" knowing what the future may have held.
You are mistaken if you believe the US would have supported another three or four years of war against an ally. Already the UK was so war weary that it kicked Churchill out of office and voted in a nebbish, Atlee.