Let's make a little wager -- $100 to a future Freep-a-thon that Russia keeps every inch of territory it now possesses.
Got the guts? I doubt it.
A 1000 pound mass (453 kg) moving at hypersonic speed of 15,000 mph (6705 meters/sec) and coming to sudden stop will conform to kinetic energy = 1/2 m v^2 and thus
10.2 billion joules.
This is 2.5 tons of TNT. The smallest of tactical nuclear weapons are bigger, so that missile will need to be carrying more mass, or easier, speed up.
As is, not equal to a nuke.