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It'd be easier to cover up by claiming it was an accident or they were fired on by the Ukranians. You don't really have the same leeway when you drop a nuke.

But they can't "easily" blame such Weapon usage on the EU (saying they accidentally caused it) or "Ukraine" terrorists.

I assume its to make sure no one in the Ukraine makes a dirty bomb, not the other way around. Revenge is a powerful motivator and Chernobyl has the raw materials to make for a horrific revenge.