> leadership doesn't trust China because they undermined Iran's position on Hormuz by backing the UAE [4]
Would you say that in the broadest possible sense, this is because China cares much more about keeping an unrestricted flow of (not $140-160 a barrel) oil coming from the Persian Gulf, oil/gas exports and outbound flow unrestricted for their own domestic consumption. They think that's much more important, given a choice and the impact of oil NOT flowing to their economies, than supporting the continuation of the IRGC and status-quo leadership in Iran.
Yes.
But the issue is China doesn't have many options to push back against the IRGC's wish for shahadat.
The political and private sector economic leadership in Iran was neutered after Rouhani was not re-appointed by Khamenei, so opposition within the regime is weak and is largely purged.
Supporting opposition against the regime is also obviously a no-go as it would both be a diplomatic bruise for China's image as well as risk a Neutral or worst case Pro-American Iran, as well as send a message to Pakistan, North Korea, Laos, and Cambodia that Chinese commitments are only fair-weather.
Supporting any intervention by neighboring countries would be diplomatically bruising for China's image and risk a Neutral or worst case Pro-American Iran, as well as send a message to Pakistan, North Korea, Laos, and Cambodia that Chinese commitments are still dependent on American power projection.
And the clerical leadership and IRGC (two sides of the same coin - to join the Pasdaran you need to be ideologically vetted by clerical leadership, and a large portion of recruits are products of the religious education system) have complete control over all the organs of Iran's armed forces and it's economy, and hold resentment against both the West and East for being morally and religiously lax as well as capitalist.