How would he have stopped it?
Just kidding. You raise a fair question.
Doesn’t matter.
The issue is moot.
Crimea was surrendered by the West and face was saved by preventing russian incursion into the Ukraine.
Crimea is afterall Russia
< How would he have stopped it? <
Putin took Crimea away from the Ukraine. But Crimea was historically part of Russia, and not the Ukraine (the Supreme Soviet of the USSR simply gave Crimea to the Ukraine in 1954).
And today about 65% of Crimeans are Russian. Only about 15% are Ukrainian.
So while it’s important for the US - and the world - to stand up to Putin, Crimea is probably not the place to do it. There’s no obvious “crime” here.
Now, on the other hand, if Putin should move into the Baltic States...
The easiest way would have been by not supporting the violent overthrow of the democratically elected President of Ukraine.
Next would have been by not recognizing the fascist regime in Kiev and forcing Ukraine to honor its constitution and restore the President to office.
“How would he have stopped it?”
With the Charge of the Light Brigade, of course.