Russian Foreign Minister Sergei Lavrov sees a "real opportunity" for the six-party talks with Iran to reach a deal on Tehran's disputed nuclear program, the foreign ministry said Saturday.

In a statement released after Lavrov spoke with Iranian Foreign Minister Mohammad Jarad Zarif in Geneva on Friday evening, the Russian ministry called the meeting "a comprehensive and interested exchange of opinions" about how to end disagreements in the negotiations.

Iranian negotiator Abbas Araqchi said "two or three" differences remain with the major powers as nuclear talks go into a fourth day in Geneva on Saturday, Fars news agency reported.

"We still have two or three points of difference. However, the two sides are getting close to an agreement," Araqchi told Fars shortly before the talks resumed.

Russia on Friday granted bail to all but one of 30 Greenpeace crew members detained over an Arctic oil protest, but dismissed a U.N. court ruling that they should be allowed to leave the country.

Courts in Saint Petersburg have now ordered the release of 29 of the Arctic Sunrise ship's crew, 28 of whom have been freed already, while one Australian activist had his detention extended until February.

Russian President Vladimir Putin said Friday it was the European Union and not Russia that was putting pressure on Ukraine, after the ex-Soviet country scrapped plans to sign a key trade deal with the bloc.

"We've heard threats from our European partners against Ukraine -- up to the point of helping them stage mass protests," Putin said, seeking to counter EU accusations that Ukraine ditched the deal after pressure from the Kremlin.

Russia's foreign minister arrived in Geneva on Friday to take part in talks between world powers and Iran over Tehran's nuclear program.

Sergei Lavrov is so far the only foreign minister from the P5+1 group -- the United States, Russia, China, Britain, France and Germany -- to be taking part in the talks.

Syria's authorities have arrested Rajaa Nasser, a dissident whose National Coordination Committee for Democratic Change is tolerated by President Bashar Assad's regime, a party official said Thursday.

Top NCCDC official Nasser "was arrested on Wednesday" in the Baramkeh district in the heart of Damascus by a security patrol, party chief Hassan Abdel Azim told AFP.

Iran's chief negotiator warned Thursday of a lingering "lack of trust" and "major differences" at nuclear talks with world powers in Geneva, saying it was hampering progress over a deal.

Abbas Araqchi, a deputy foreign minister, said Iran would not sign up to an agreement on its controversial nuclear program unless the so-called P5+1 group accepts what Tehran considers its right to enrich uranium.

With a queue stretching at least a kilometer, a hi-tech exhibition giving a rosy view of the house of Romanov and jointly organised by the Russian Orthodox Church and the Kremlin has drawn tens of thousands of visitors in central Moscow.

In another sign of the power of the Russian Orthodox Church in post-Soviet Russia, it is a holy icon which has drawn the crowds as much as nostalgia for Russia's ousted by the monarchy.

Israeli Prime Minister Benjamin Netanyahu on Wednesday insisted on the need for a "real" solution to the Iranian nuclear crisis, after talks with Russian President Vladimir Putin in Moscow.

Putin said that the two men discussed the Iranian nuclear standoff "in detail" at Kremlin talks which overran by several hours. But the Israeli premier was insistent that only the strongest of diplomatic solutions was acceptable for his country.

Russian authorities released a Brazilian Greenpeace activist from prison in Saint Petersburg on Wednesday after she was granted bail, the first of 20 arrested campaigners set to leave jail.

Ana Paula Maciel, a deckhand on Greenpeace's Arctic Sunrise ship, walked out of jail following two months in detention after she and 18 crewmates were granted bail, the group said.