China and Russia won't intervene to save Iran if there is a full fledged attack on them by a coalition force that includes the Americans, British, Israelis, Saudis and their Arab allies. I am also advocating for Pakistan, Azerbaijan, Turkmenistan and the Kurds to participate in the war on Iran and join the allied coalition. Pakistan will receive Iran's Sistan and Balochistan province, united with its own Baluchistan, the Turkmen areas of Iran will be united to make a Greater Turkmenistan, the Azeri areas to make a Greater Azerbaijan, and the Kurdish areas will be united with Iraqi Kurdistan to make a viable, independent Kurdish state.
At the same time, the internal discontent boiling over in Iran among ordinary Iranians who are sick of the regime, will also cooperate to liberate their country. They won't be too happy about Iran losing so much territory, but they will end up with a democratic and secular Persia totally aligned with the West, their dream for so long.