Ooh! I’m sure Trump is shaking like a leaf over this threat... NOT! LOL
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Trump had better NOT underestimate Russia. That would be stupid.
Putin would and will be stupid to underestimate Trump.
When Trump makes threats he typically follows through... Unlike Putin who makes idle threats on a regular basis... For instance... When will Russia start helping their buddies in Iran with restoring their nuclear tech again? And how many Russian scientist would like to die in Iran while doing that?