[SAI_Peregrinus]

The best strategy is tit-for-tat with eventual forgiveness attempts. It's way too soon for that (the US is still controlled by Republicans) but one eventually re-opening trade might be optimal, assuming there's still a USA to trade with.

[ben_w]

Tit-for-tat inherently forgives the moment the other party stops defecting, in a game theoretic sense. It's "start friendly, every future move copies other party's previous move".