China, North Korea vow to strengthen ties hours after US nuclear talks collapse

China and North Korea on Sunday vowed to continue strengthening their ties that have “stood the test of time”, hours after another squabble broke out between Pyongyang and Washington over the breakdown of their first nuclear talks in eight months.Chinese President Xi Jinping exchanged congratulatory messages with North Korean leader Kim Jong-un on the 70th anniversary of diplomatic ties, according to state media in both countries, amid speculation that Kim will soon pay another visit to China…