Ukraine? I am not so sure the US would have faired much better in the initial invasion, Ukraine understood early on how small drone fpv drone tactics can be used to grind an enemy force to a halt in a way the US military like most militaries largely resisted.

Russia failed the initial invasion alone. Troops were standing in towns with no idea what they were doing or where they were. Massive columns ran out of gas before getting anywhere. Ukrainian defense, once it popped off, was mostly guerrilla tactics with anti tank launchers from NATO. They didn't really start using kamikaze FPVs until weeks or months into the war. Also there was very little Russian air support in the early days of the invasion.

The US going up against a near peer threat is scary. Take a look at one of the many videos about day 1 of the gulf war. The US knocked out two early warning radars and completely destroyed all communications infrastructure in Baghdad all within the span of about a minute due to meticulous timing of missile launches and bomb drops.