The US Secretary of State Hillary Clinton is in Moscow for talks with the Russian leaders. She is likely to urge the Russian leaders to support a tougher stance towards Iran's controversial nuclear programme. Mrs Clinton is in Russia on the final leg of her five-day European visit and will meet President Dmitry Medvedev. She has warned that the world will not wait indefinitely for proof that Iran is not making nuclear weapons. Tehran, which recently revealed a second uranium plant, insists its programme is for peaceful purpose.