Pakistan’s forces bombed Iran overnight in an apparent retaliation for an Iranian strike in Pakistan on Tuesday, a show of force that could put pressure on China’s ability to manage relations between its partners.

“This action is a manifestation of Pakistan’s unflinching resolve to protect and defend its national security against all threats,” Pakistan’s Foreign Ministry said in a Thursday statement. “Pakistan will continue to take all necessary steps to preserve the safety and security of its people which is sacrosanct, inviolable and sacred.”