US President Donald Trump has lavished praise on Japan's first female leader Sanae Takaichi in Tokyo, welcoming her pledge to accelerate a military build-up and signing deals on trade and rare earths.

Takaichi, a protegee of Trump's late friend and golfing buddy Japanese leader Shinzo Abe, applauded Trump's push to resolve global conflicts, vowing to nominate him for the Nobel Peace Prize, according to Trump's spokeswoman, Karoline Leavitt.

Japan is also expected to offer a package of US investments under a $US550 billion ($A839 billion) deal agreed earlier in 2025, including shipbuilding, and pledge purchases of US soybeans, gas and pick-up trucks, sources familiar with the talks said.

Those gestures might temper any Trump demands for Tokyo to spend more towards its security in the fac

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