Well he would do seeing as he is Putin's bitch.
I'm not sure about that.
I think he just says anything he thinks will resonate with the type of moron who would vote for him.
For one he knows these morons have been imbibing Russian propaganda to the extent that many of them now favour Russia over the West, many would relish seeing their government "punished" by Russia for its bad treatment of them.
He also knows these morons are at the bottom of society, and they typically have a deep pathological need to look down on others, see some "manners" put upon them, be punished for not "paying their way" etc.
Trump's moronic followers see themselves as the only victims worthy of being talked about, and they relish "punishment" of other competitors for the victimhood their whole political engagement revolves around.
Consider all of their talking points like LGBT people, immigrants, the "elites", the Covid pandemic, the climate change crisis, NATO, Trump losing the election, BLM, the "globohomo" world order conspiracy, hate speech laws, replacement theory, and so on.
It is always the same formula -
that they are the victim in all these things.
So here Trump first makes his acolytes feel they are victims, in having as taxpayers to pay all the money, and do all the military work of NATO etc.
Then he suggests he will have their back in their sense of being victimised thus, by having any country "not paying their way" suffer the consequences.
It's always about getting the the votes from these morons.
As to his real attitude towards Putin, and NATO, well perhaps the following illustrates it better (although the exchange is still about money).