A leader would do it. A leader would be respected as such and more than likely the warning would be all that was needed to stop the BS. Putin is doing this crap because he can and he knows it. I'd like to see that change. Trump strikes me as the type to do what he says he'll do.
Trump strike me as the person to say what he says he'll say.
The "DO" part, well that's not yet in evidence.
A leader doesn't even need to actually make Russian shark food. Credibility is all that matters.
Anyone remember when Reagan said "the bombing begins in 5 minutes" and everyone freaked? Because they all knew in their bones that the man would never rule out pushing that button.
And it's not just coincidence that the Americans held in Iran were released on Inauguration Day, 1981.