BEIJING -- It is unacceptable for the United States and Israel to launch strikes on Iran during the Iran-US negotiations, Chinese Foreign Minister Wang Yi said during a phone conversation with his Russian counterpart Sergei Lavrov on Sunday.

Wang, also a member of the Political Bureau of the Communist Party of China Central Committee, said that it is also unacceptable for them to openly kill the leader of a sovereign state and encourage government transfer, adding that these actions violate international law and basic international relations.

China firmly opposes, strongly condemns attack, killing of Iran's supreme leader, Wang said, adding that the attack and killing of Iran's supreme leader tramples on the purposes and principles of the UN Charter and basic norms in international relations.