BEIJING (AP) — The leaders of China and Vietnam pledged to further their economic ties and gave a nod to their shared communist ideology during the first visit by Vietnam’s new president to Beijing on Monday. To Lam, who took office in May, made China the destination of his first state visit, signaling the continuing importance the Southeast Asian nation places on its giant neighbor despite ongoing territorial frictions in the South China Sea. Chinese President Xi Jinping and his wife, Peng Li