China said on Monday it opposes foreign "interference" in other countries after US President Donald Trump threatened to intervene militarily if Tehran killed protesters.
"We always oppose interference in other countries' internal affairs," foreign ministry spokeswoman Mao Ning told a regular news conference when asked about Trump's comments.
"We call on all parties to do more things conducive to peace and stability in the Middle East," she added.
German Chancellor Friedrich Merz said on Monday that Iran's use of "disproportionate and brutal violence" against protesters was "a sign of weakness".
"We condemn this violence in the strongest possible terms," he said during a visit to India.
"This violence is not an expression of strength, but rather a sign of weakness. This violence must end."