DHAKA: The US remains "deeply concerned" about China`s new air defence identification zone (ADIZ), Vice-President Joe Biden said as he began a tour of East Asia.

In written responses to Japan`s Asahi newspaper, Mr Biden said China and Japan had to establish measures to lower tensions, reports BBC.

Biden arrived in Tokyo late on Monday and will then head to Beijing and Seoul during his six-day visit.

The air zone row is likely to dominate the week of talks.

Biden`s most important task this week will be persuading Beijing and Tokyo to stop baiting each other, and to start talking about how to avoid an unintended clash, reports the BBC`s Rupert Wingfield-Hayes in Tokyo.

Both the US and Japan have voiced strong criticism of China`s establishment of an ADIZ that includes islands claimed and controlled by Japan. It also includes a submerged rock claimed by South Korea.

China says aircraft operating within its ADIZ must follow certain rules such as filing flight plans, or face "defensive emergency measures".

US, Japanese and South Korean military aircraft have all defied these rules and Japanese commercial carriers have agreed to a government request not to comply.

On Friday, China scrambled fighter jets to monitor US and Japanese planes flying in the area.

Biden told the newspaper that the establishment of the ADIZ underscored "the need for agreement between China and Japan to establish crisis management and confidence building measures to lower tensions".

As well as "the strength of our alliance commitments" with Japan, he planned to "emphasise the importance of avoiding actions that could undermine peace, security and prosperity in the region", he said.

Biden was met at the airport late on Monday by the new US envoy to Japan, Caroline Kennedy. Later on Tuesday, he meets Japanese Prime Minister Shinzo Abe.

BDST: 1131 HRS, DEC 03 , 2013