Abe told a parliamentary session that China's declaration of the zone above the islands (known as the Senkaku in Japan and Diaoyu in China) altered the state of affairs in the East China Sea and escalated a tense situation.
"The measures by the Chinese side have no validity whatsoever on Japan, and we demand China revoke any measures that could infringe upon the freedom of flight in international airspace," Abe said during an upper house session. "It can invite an unexpected occurrence and it is a very dangerous thing as well."
"The United States is deeply concerned by the People's Republic of China announcement today that it is establishing an air defense identification zone in the East China Sea. We view this development as a destabilizing attempt to alter the status quo in the region. This unilateral action increases the risk of misunderstanding and miscalculations.
"This announcement by the People's Republic of China will not in any way change how the United States conducts military operations in the region.
"The United States is conveying these concerns to China through diplomatic and military channels, and we are in close consultation with our allies and partners in the region, including Japan.
"We remain steadfast in our commitments to our allies and partners. The United States reaffirms its longstanding policy that Article V of the U.S.-Japan Mutual Defense Treaty applies to the Senkaku Islands."