The formal invitation for Tokyo to join the negotiations was extended at a meeting of members of the Trans-Pacific Partnership (TPP) on Saturday on the sidelines of the Asia-Pacific Economic Cooperation gathering in Surabaya, Indonesia, according to a joint statement.

Japan will join 11 nations already in talks on the TPP: the United States, Canada, Mexico, Peru, Chile, Vietnam, Malaysia, Singapore, Brunei, Australia and New Zealand. Members hope to reach a deal by the end of this year.

With the world's third-largest economy on board, the final TPP pact would cover nearly 40 percent of global economic output and one-third of all world trade.

Abe has prescribed a three-part economic plan of hyper-easy monetary policy, big fiscal spending and steps to spur longer-term growth, including deregulation and government backing to beat deflation and engineer lasting recovery. Joining the TPP talks is seen as the first, key element of that growth strategy.

"Japan's participation in the negotiation will underscore the economic significance of TPP and its promise as a pathway toward a Free Trade Area of the Asia Pacific," said the joint statement by trade ministers of the TPP member nations.

Japan hopes to participate in the July round of negotiations, which would require the White House to quickly give Congress 90-day notice of its intention to begin trade talks with Tokyo.

A 17th round of talks is currently scheduled for May in Peru. The dates and location of the 18th round in July have not yet been announced.

Last week, Japan struck a deal with the United States to get Washington's support to join the TPP talks.

The TPP talks are officially slated to conclude this year, although many trade experts expect them to stretch into 2014.

Japan is hoping to protect key agriculture goods such as rice, wheat and dairy products to appease its politically powerful farm lobby.

"Japan will aim to secure tariffs on agricultural products after entering the TPP talks. The situation is quite tough but we have not given up," a senior government official said.

Kazuhito Yamashita, research director at the Canon Institute for Global Studies, said Japan should be looking beyond the TPP to boost broader trade ties.

"Japan can have bargaining power as the nation is the only one involved in trade talks such as the TPP, Japan-EU, Japan-China-Korea, and the RCEP," he said.

Talks on a Regional Comprehensive Economic Partnership trade block include the 10-nation Association of South East Asian Nations (ASEAN) along with Japan, China, South Korea, Australia, New Zealand and India, but not the United States.

"Japan is in a very interesting strategic position. Japan could become a hub in South East Asia and a bridge between the region and the West if the authorities clearly understand this."

(Editing by Sanjeev Miglani)

By Kaori Kaneko