Early game strat:
Play opponent’s one-shot events, don’t play your own one-shot events. This includes the headline phase.
Ideally, you want to never discard for space race.
Hold or UN key cards like Destalinization and Decolonialization, but everything else can just be played and dealt with. Note that the US has no early war cards that need to be avoided, but using UN on something recurring is still good since it gives you more draws for the power/4AP cards.