It's not so much that the Trump campaign pushed — while leaving rest of the other GOP platform alone — to defang an anti-Russian pro-Ukranian plank, but that they are so insistent that they didn't do it.
Trump Campaign Changed Ukraine Platform, Lied About It
Top Trump aide Paul Manafort swore that the campaign had nothing to do with a radical change in the official Republican Party position on Ukraine. He was lying.
I'm afraid their tactic is to lie about everything so we'll just stop paying attention to individual lies.
+John Bump It's been noted before that each crazy statement / gaffe / zany utterance from Trump has served to … well, cause folk to forget the previous ones, or at least relegate them to "old news".