While Russia, China, and North Korea condemned the U.S. strikes, only Russia called the aggression groundless. Iran has ties with Hezbollah in Lebanon and the Houthis in Yemen, but these groups have not directly engaged Israel since the U.S. bombing.

Crowds of Iranians gathered in public on Sunday to express anger about the US’s missile strikes on nuclear sites in Iran and amplify their leaders’ promise of retaliation. CNN’s Fred Pleitgen reports from protests on the streets of Tehran.

From Washington and New York to Athens and Karachi, protests against the US’ decision to strike Iran took place in multiple locations around the world on Sunday. The US decisively entered the Israel-Iran conflict by attacking three Iranian nuclear sites over the weekend.