That is what he said before he didn't say that. But you knew that. September 29. "And I’m saying, ‘Why are we knocking ISIS and yet at the same time we’re against Assad?’ Let them fight, take over the remnants. But more importantly, let Russia fight ISIS, if they want to fight ‘em … in Syria,” Mr. Trump said.
The statement that he would let Russia fight Isis in Syria is something that I think all Americans except some diaper wearing establishment types would agree on. We have worked with the Russians on many things since the end of the Cold War. It has been more difficult to work with Putin than before, but on Isis, I think we can agree with the Russians to kill as many of them as possible and destroy their fledgling state.
What your first quote implies, falsely, is that Trump said let the Russians take care of America's problems for us, as though he would shrink from leading a fight against Islamic terror when it is in fact a huge part of his policy. He has talked about what he would do to ISIS on many occasions, and it isn't to treat them with kid gloves.
So, you are just making crap up to favor some establishment candidate that you support.