It's very unpopular and unwise to admit that Trump cooperated with Russia/Putin.I've said that repeatedly. When you want to negotiate a deal with someone you don't usually start out insulting them.
Trump's background is for all practical purposes one of being a salesman so that's how he approached everything.
The only correct talking point that will make you popular is to say that Trump frightened Russia/Putin.
The record of no threat of nuclear war during Trump's regime is written in history, regardless of whether or not Trump had anything to do with it.
Fwiw, his mistake on Iran could some day come home to haunt America. 'If' Iran wishes to procure nuclear weapons, it will.