Let's pretend you live in Spain. What's the logistical likelihood of you and your mates going to Ukraine and ousting someone?
The US is fucking huge. Imagine mobilizing a crowd from the midwest to Washington, forget the west coast. Chicago to DC is 696 miles (1120 km for the civilized). Illinois, where Chicago is, has a population of 12 million. That's a lot of organizing we don't already have in place. We're working on it.
Checks source: oh, looks like The Hill is manufacturing consent again.