NUSA DUA, Indonesia (Reuters) – U.S. President Joe Biden said on Monday he and his Chinese counterpart Xi Jinping had blunt talks over an array of issues, including Taiwan and North Korea, that have contributed to the worst U.S.-Chinese ties in decades. BIDEN AND XI * The meeting ahead of the G20 summit, being held on Tuesday and Wednesday on the Indonesian island of Bali, was their first in-person talks since Biden became president. * In a statement after their meeting, Xi called Taiwan the “first red line” that must not be crossed in U.S.-China relations, Chinese state media said. * Biden sa…