Chinas official policy is not to export revolution and not to interfere in countries internal matters. I feel like their goal is simply to outlast everyone else.

This is of course frustating but it is the path they chose. It’s not just a matter of foreign policy but the direction of the country as a whole. The Soviet economy was decoupled from the west and existed as a parallel system for countries to break free from western hegemony, which is why they could support national liberation movements everywhere. It’s also why after the USSR fell countries across the world dropped Marxism-Leninism for social democracy or worse. China on the other hand is wholly integrated into the global economy and does not have that same capacity.

Revolutionary Iran is explicitly against American-Israeli influence in the Middle East and they have been punished for it with crippling sanctions.