Reports said India and Japan may sign a civil nuclear cooperation pact during PM Modi's visit there.
Prime Minister Narendra Modi will visit Japan next month for an annual summit that is expected to deepen defence ties to counter an assertive China and the signing of a civil nuclear deal.
PM Modi will have an audience with Emperor Akihito and hold talks with his Japanese counterpart Shinzo Abe during the two-day visit starting on November 11.
The premiers have forged an unusually close relationship since PM Modi came to power in 2014.
Media reports said they may sign a civil nuclear cooperation pact after failing to do so at their last meeting, citing outstanding technical and legal differences.
The long-mooted agreement is expected to allow Japan to export its nuclear plant technologies to the subcontinent.
Japan has in the past shunned civil nuclear cooperation with India, which has not ratified the international Non-Proliferation Treaty, but appears to have softened its stance.
Closer defence and security ties, including joint maritime exercises, are also likely to be on the agenda. China is expanding its deep-water naval presence and has staked claims to disputed areas of the East and South China Sea and Indian Ocean region, parts of which Japan also claims.
India has a longstanding territorial dispute with China.
Tokyo has its own spat with Beijing over islands in the East China Sea, and is increasingly vocal over its ambitions to control almost the whole of the South China Sea.
PM Modi visited Japan in August 2014 on his first bilateral trip outside South Asia months after coming to power.
Subsequently, Mr Abe paid a two-day visit to India last December when both premiers agreed on a slew of deals, including India's first bullet train, defence technology and civil nuclear cooperation.