China has joined Russia in congratulating North Korea on the conclave of its ruling party, hailing economic achievements under the leadership of Kim Jong-un and pledging to work with Pyongyang to promote regional peace. According to state news agency Xinhua, the Central Committee of China’s Communist Party sent a congratulatory message to Pyongyang on Thursday, asserting that the ruling Workers’ Party had in recent years helped to develop the North Korean economy and improve the lives of its...