China has condemned the ongoing  US-Israel war against Iran and the killing of   Supreme Leader Ayatollah Ali Khamenei, with Beijing calling it "a serious violation of Iran's sovereignty and security" which tramples "on the aims and principles of the UN Charter and the basic norms of international relations."    Naturally, Chinese concerns reach beyond the respect for international law — Iran is one of China's most important suppliers of oil and natural gas. According to estimates, as much as