China supports Iran in defending its “sovereignty, security and national dignity,” Chinese foreign minister Wang Yi told Iran’s acting foreign minister in a phone call on Sunday, according to a statement by China’s foreign ministry.

In the phone call, Wang repeated Beijing’s denunciation of the assassination of Hamas chief Ismail Haniyeh in Tehran on July 31, saying the strike had violated Iran’s sovereignty and threatened regional stability.

Iran and the Palestinian Islamist group Hamas have accused Israel of carrying out strike that killed Haniyeh.

Israel has not claimed or denied responsibility for the killing, which has fueled concern that the war between Israel and Hamas in the Gaza Strip was turning into a wider Middle East war.

Iran has vowed to “harshly punish” Israel over the assassination.

Wang told Ali Bagheri Kani, Iran’s Acting Foreign Minister, that the killing of Haniyeh had “directly undermined the Gaza ceasefire negotiation process and undermined regional peace and stability,” China’s foreign ministry said.

“China supports Iran in defending its sovereignty, security and national dignity in accordance with the law, and in its efforts to maintain regional peace and stability, and stands ready to maintain close communication with Iran,” Wang was quoted as saying.