BEIJING (AP) — China will send a leading member of the Communist Party's all-powerful Politburo Standing Committee to Pyongyang this month for commemorations of the founding of North Korea's ruling party.Sunday's announcement comes amid a long dry spell in exchanges between the sides, whose traditional close relations have been strained by North Korean missile launches and nuclear tests.A party announcement said that Liu Yunshan, ranked fifth in the party hierarchy, would travel to the North on Friday.