Russian and US negotiators held productive talks on reaching a new nuclear weapons disarmament treaty, the White House said Friday, adding it was "pleased with the progress."

Moscow and Washington are locked in talks to hammer out a new pact to replace the Strategic Arms Reduction Treaty (START), signed in 1991 just before the break-up of the Soviet Union, and which expired on December 5.

"We are pleased with the progress made and expect negotiations to continue as we work to iron out the final details," spokesman for the National Security Council, Michael Hammer, said.

National Security Advisor General James Jones and the chairman of the Joint Chiefs of Staff, Admiral Mike Mullen joined two days of closed-door talks in Moscow with their Russian counterparts, Hammer added in his statement.

They "held productive talks with General Nikolay Makarov, chief of the General Staff of the Russian Armed Forces, other senior Russian military officials, and the Russian START negotiating team."

The talks "discussed the ongoing effort to finalize a START agreement as well as other security issues, including Afghanistan, Iran, missile defense and continued US-Russian cooperation on issues of mutual concern."

Russian President Dmitry Medvedev said earlier this month the two sides had made "significant" progress towards a new nuclear disarmament treaty.

Negotiators from both sides have so far failed to agree a successor treaty.

Despite intense negotiations in Geneva, officials were not able to overcome before the Christmas holidays a range of disagreements on issues such as the numbers of carriers and inspections.

US President Barack Obama and his Russian counterpart have set a goal of reducing the nuclear warheads stockpile to between 1,500 and 1,675 for each country.

The presidents also agreed that the number of "carriers" capable of delivering the warheads should be limited to between 500 and 1,100.

The United States has said it currently has some 2,200 nuclear warheads, while Russia is believed to have about 3,000.

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