Russia may become the second important nuclear material supplier for India, following the US, which may bring further disorder on world mechanisms for nuclear nonproliferation as India is still a non-signer of the Nuclear Non-Proliferation Treaty (NPT), Chinese experts said.

Indian Prime Minister Manmohan Singh arrived in Moscow on Sunday for talks on a landmark deal that could significantly widen nuclear fuel imports from Russia.

The talks on a civilian nuclear deal to widen uranium fuel deliveries - and signing deals for aircraft and other military hardware - will be center stage during the three-day visit which ends today, Indian officials said.