WASHINGTON, June 15 (Reuters) - 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. read more

The Group of Seven leaders issued a statement on Sunday scolding China for a series of issues and underscoring the importance of peace and stability across the Taiwan Strait, comments that China called "slander." read more

Kritenbrink, a career foreign service officer who was most recently ambassador to Vietnam and a former deputy head of mission in China, was asked if Washington should switch from a long-standing stance of "strategic ambiguity" to make a clear commitment to defend Taiwan in the event of a Chinese attack.

He said the U.S. "one-China" policy that formally recognizes Beijing and not Taipei had ensured cross-strait stability and Taiwan's security for many decades.

He added: "I do think that maintenance of that status quo and of that security is a dynamic situation. As the threat from (China) grows, as Beijing's aggressive and bullying behavior vis-a-vis Taiwan grows, I think that our response has to be calibrated as well."

Responding to a request for comment, Chinese Embassy spokesman Liu Pengyu said Washington should "stop elevating its relationship with the Taiwan region in any substantive way ... so as to avoid serious damage to China-U.S. relations and peace and stability across the Taiwan Strait."