Kinzinger doesn't like Trump, and some claim Trump is too sympathetic to Putin's cause, so perhaps Kinzinger is just doing the anti-Trump thing to show he's not Trump, Orange Man Bad, etc. At any rate, I don't view it as very important.
It's a minority position and them some, and no one is really serious about doing such a thing. One person here has suggested we bomb Moscow, probably not seriously, I've heard others say we should keep out of it entirely.