Because he is a mentally defective "leader" who wants nothing more than to please Putin. So every Republican who pushes that bullsh** speaks for Putin word for word. If they don't know they are dumber than I give them credit for being. It's possible.
No one is claiming Russia did not meddle. Just pointing out that some in Ukraine also meddled.
National Committee (DNC) consultant called Alexandra Chalupa, who is of Ukrainian heritage. Worked with Washington diplomats and Ukr embassy to get dirt on Trump and Manafort.
There was info released by Ukr about Manafort by Urkraine.
Ukrainian ambassador in the US, Valeriy Chaly, wrote an opinion piece criticising Mr Trump. Ukrainian Interior Minister Arsen Avakov called Mr Trump's remarks "shameful."
Ukriane politican Sergei Leschenko was involved with Fusion GPS and the fake Trump dossier (Steele and Russian info). Also in the Ukr department that released the Manafort information.