Cant remember now where i read it, but speculation is that when Trump met Putin and they talked behind closed doors for 2 hrs one key thing discussed was Syria and Iran. The speculation as I remember it was something along the lines of the US saying to Putin we recognise your dominance over Syria and we wont challenge that, but we want to push back Iran.
What that means is anyone's guess, but today's "suffer consequences" warning shot against Iran doesn't bode well in that narrative.
Lest we forget John Bolton is in the hot seat here.
When Trump announced a new forthcoming meeting with Putin it was phrased that Bolton will be doing the inviting
Just googled John Bolton and this is the first thing that comes up (published last night)
Warnings of 'Iraq War Redux' as Bolton and Pompeo Are Reportedly Leading Push to 'Foment Unrest' in Iran
Some of the conversation upthread about how great it is that Trump is talking to Putin, that its some kind of attempt to thaw the last ice patches of the cold war, are IMO really misguided and born of wishful thinking. Its all geopolitics, its all about weakening US "foes" (now including the EU), and its far from benign. Its also about normalising strong man anti-democratic, anti-liberal leaders on the global stage and shifting the Overton window of what is normal and acceptable.