[Nogbad]

They don't have 200 bombs,
nor the means to deliver them
and even if they did
that still would be under 40 Megatons.

Russia once tested a 50 megaton bomb,
much close to China and Alaska.

[RightWhale]

They don't have 200 bombs

They do. But they are not clean bombs. 200 dirty bombs would spread a lot of radioactive fallout. Everybody will get some.