The rest of the developed world is just going to have to accept that if they want to move forward on anything, they just have to do it. If the United States wants to play ball, they'll come along, and if not, just don't even bother trying to court them. I think the G7 relies, and has relied too heavily on the US leadership in the past, and it's just not going to happen right now - the GOP is very "stay the course or regress" at the moment, and Trump himself is more interested in playing to his base and distracting from scandal than anything at the moment. His strategy of "well I'll just take my ball and go home" is has to lead to the rest of the world moving on without him, or we will literally get nowhere - it's not worth any political capital to try and convince the current administration of anything.
