Melania Trump walked straight into the global crossfire by putting pen to paper in a letter to Vladimir Putin -- and that's made her prime roast material, according to Jack Schlossberg , who just posted a parody video mocking the First Lady.

JFK’s grandson doubled down on his recent taunting of Melania on "TMZ Live" Monday, insisting it’s not about hating her or Trump -- he points out with a brutal war tearing through Europe, seeing Putin -- who's accused of horrific war crimes -- get a hero’s welcome on U.S. soil was way over the line, and the apparently heartfelt letter Melania wrote ain't moving the needle. Play video content

Catch our clip -- Jack goes all in, saying yeah, Melania’s wish that kids don’t suffer is fine ... but she, Trump, and the U.S. need to get seri

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