**US Secretary of State Hillary Clinton has arrived in Moscow on the final leg of her European visit.**Mrs Clinton is due to hold talks with President Dmitry Medvedev and Foreign Minister Sergey Lavrov on Tuesday.
She is said to be hoping to win Russian support for the US government’s stances on Iran’s controversial nuclear programme and global arms control.
On Sunday, Mrs Clinton warned Iran the world would “not wait indefinitely” for proof it is not making nuclear weapons.
Tehran insists its nuclear programme is solely for peaceful purposes.
Sanctions
The BBC’s Richard Galpin in Moscow says Mrs Clinton’s visit comes at a crucial moment in relations between the United States and Russia.
President Barack Obama pledged to reset relations with Russia when he came to office, and his meeting with Mr Medvedev in July certainly went some way towards that, our correspondent says.
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Since then, Mr Obama has met a key Russian demand to scrap plans to deploy interceptor missiles in Poland and a radar station in the Czech Republic as part of a US missile defence system in Europe.
Although the Americans insist they do not expect anything in return, it is already clear that Iran will be very high on Mrs Clinton’s agenda in Moscow on Tuesday, our correspondent adds.
US officials say their government wants Russia to support, or at least not oppose, the idea of the UN Security Council imposing tougher sanctions on Iran if it does not suspend its uranium enrichment programme by the end of the year.
Russia, which has the power to veto resolutions as a permanent member of the Security Council, has consistently said it does not believe sanctions are effective.
However, our correspondent says, Mr Medvedev recently indicated that he might ultimately accept that sanctions were inevitable.