Trump has literally said he might not fulfill our Nato obligations and trade deals, which have been the bedrock of world stability for the last 70 years. He has no worldview or any understanding of foreign policy(Man just suggested that China should invade North Korea WTF).
But HRC says mean things about Putin, so she is clearly the dangerous one here.
NATO countries are obliged by treaty to spend 2% of GDP on Defence. The US, UK, Poland, Greece and Estonia are the only NATO countries that fulfil their side of the bargain. If Trump insists that the other countries will also have to pay up if they want the US to keep its side of the bargain then they have a simple choice. Pay up or leave NATO. Given that stark choice most of them will choose to pay up (if Estonia, Greece and Poland can do it then the others all can as well). Problem solved.
As for for foreign policy more generally Trump makes it very clear, if you're nice to me I'll be nice to you. If you hit me I'll hit you back proportionately. International leaders will get the message very quickly and respond accordingly.
As for trade deals if the most powerful country on earth insists on some renegotiations then most politicians are realists. There will be new negotiations and modified deals.
