I honestly don't think Putin cares that much. Putin just wants to see chaos and division, and Trump just being this close is already a huge win for him.
Would he get even more of Trump wins? Sure, but he's already doing whatever he wants and the Republicans are a huge asset whether they're in the White House or not.
McConnell isn't mad. He's gloating because he won the long game he'd been playing at least 2016: packing the Supreme Court and as many federal circuits as possible. At this point, he's just trying to muddy the waters and lend a tiny bit of credence to the "both sides" arguments that confuse casual voters.