Ya sure, defeated and pushed back. Not only can't Russia lie well, they apparently haven't learned anything about conducting a war in two years.

The Russians are so inept they are relegated to using WWI tactics - long and wide linear formations. The Germans conducted a massive AAR of WWI and developed the doctrine known as Blitzkrieg before the onset of WWII. The doctrine entailed using mechanized forces and aviation to support maneuver in order to attack enemy forces, thereby breaking the gridlock of WWI tactics. If the Ukrainians had more aviation like attack helicopters, fighters, bombers, and CAS, it would have a chance to win the war.

This is how the US would fight Russia if it was stupid and crossed a red line like attacking a NATO country. The Russians know this, and I assume they are rational enough not to test US military power. The US military will employ air and ground assets that would destroy the Russian army in Ukraine quite easily.