Hello Bill,
This is one of the biggest tragedies of the 'US First' mentality. We break off relations with other nations, then when something big comes along which requires cooperation, we don't have good working relationships with them. We have a leader who doesn't understand how a good relationship works, nor why you might want or need one. He is a completely dysfunctional communicator. Everything is a competition with him. No matter what is going on, he figures there is a winner and a loser. And he always wants to be the winner. The only problem is: his premise is wrong. He has no concept of win/win philosophy. He thinks that's a joke, thinks everybody should be as diabolical as he is. If they are not, then he will take advantage of that. Totally unprepared for ever NEEDING anything, such as cooperation with other nations for mutual benefit.
Relationships which have taken years to build are being destroyed. And the damage will last long after he is gone. Those kinds of things cannot be quickly put back together again. DT has been a tragedy for the State Department.
This hurts our economy in the long run. When nations lose confidence in the USA, they become reluctant to do business with us. If they don't think they can rely on us, they are more likely to look elsewhere. This is eroding our long-term power in the world, eroding our super-power status.