North Korea pulled back its threat to attack a U.S. territory, after days of trading increasingly bellicose rhetoric with U.S. President Donald Trump, and hours after China took its toughest steps against Pyongyang to support U.N. sanctions.

North Korean state media said Tuesday that Kim Jong Un had made his decision not to fire on Guam after visiting a military command post and examining a military plan presented to him by his senior officers. But it warned that he could change his mind “if the Yankees persist in their extremely...