Tit for tat (start by cooperating, and for each subsequent choice do what your opponent did last turn) is the optimal for repeated 2-party prisoners' dilemma.

The real world is much more complex. OPEC is a multi-party game, for starters. For another thing, there are cascades of social/political problems that get in the way of optimal strategy at the level of nations. I.e. that only works if politicians are more interested in solving problems than controlling narratives or maintaining power. Unfortunately, an ineffective leader can be sustained by controlling the narrative, while an effective leader can be destroyed by lack of control over the narrative. And one of the best ways to control a narrative (especially if you aren't a very good leader to begin with) is to create so much chaos that it distracts from your shortcomings, and blame the chaos on enemies.