WASHINGTON, USA (AP) — The United States on Friday invited Japan's new prime minister to the White House next month, as the Asian nation's top diplomat signalled the government's intent to strengthen security ties with the US.

Prime Minister Shinzo Abe's conservative government took power last month after a sweeping election victory and faces stiff challenges in reviving a stagnant economy and managing an escalating dispute with China over an island chain in the East China Sea.

Abe is eager to make an early trip to Washington to demonstrate the US alliance is the cornerstone of his foreign policy, and wants Japan to be a bigger player on the global stage.

Secretary of State Hillary Rodham Clinton announced the White House invitation for the third week in February after meeting Foreign Minister Fumio Kishida at the State Department, and she described the US relationship with Tokyo in similar terms.

"Our alliance with Japan remains the cornerstone of American engagement in the region," Clinton told a joint news conference.

Kishida said the security environment in the Asia-Pacific is "ever more challenging" and that cooperation between the US and Japan is "indispensable" for maintaining peace and stability.

Friday's meeting took place against a backdrop of heightened tensions in Northeast Asia.

Japan and China, the world's third- and second-largest economies, are at loggerheads over tiny, uninhabited islands, known as Diaoyu in China and Senkaku in Japan. The long-running dispute sharpened in September when Japan's government bought some of the islands from private owners. That sparked violent protests in China, which also claims them as part of its territory.

Chinese vessels have since repeatedly ventured into what Japan considers its territorial waters. In a worrying development last week, the two sides scrambled jet fighters to the area.

The US has been counseling calm. It could be compelled to come to its ally's defence in case of a conflict. The US has about 50,000 troops based in Japan.