WASHINGTON—The nominee to be the top U.S. diplomat for East Asia said on Tuesday that Washington should develop its relationship with Taiwan in every sector, hours after China’s largest reported incursion to date into the island’s air defense identification zone. Daniel Kritenbrink said it was important for Washington to demonstrate its resolve to meet its “rock-solid obligations” toward Taiwan in the face of pressure from China, which claims the self-governing island as its own territory. “It’s … incumbent upon us to further develop our robust relationship with Taiwan in every sector,” Kritenbrink told a Senate Foreign Relations Committee hearing on his nomination to be assistant secretary of state for East Asia. Earlier, Taiwan said 28 Chinese aircraft, including fighters and nuclear-capable bombers, entered its air defense identification zone. The Group of Seven leaders issued a statement on Sunday scolding China for a series of issues and underscoring the importance of …