U.S. Secretary of State Hillary Clinton says there has been substantial progress on a new nuclear disarmament deal with Russia. Mrs Clinton and her Russian counterpart Sergei Lavrov said at a joint press conference in Moscow that a new Strategic Arms Reduction Treaty (START) should be finalised soon. The nations are trying to replace the 1991 treaty that expired in December.Mr Lavrov said that Moscow and Washington are in the final stage of a new START.Iran is also a major issue with the U.S and Russia publicly disagreeing on the planned opening of an Iranian nuclear power station.Mrs Clinton is attending two days of talks in Moscow including a key meeting on the West Asia today.