He was careful to offer the caveat, "all will depend on the details of the proposal". It restricts the number of strategic nuclear warheads the pair can deploy to not more than 1,550. It expires on February 5.
Russian Federation had offered the Trump administration a five-year extension of the New START treaty without preconditions and signaled this week that the deal was still possible. Previously, the spokesman indicated, the U.S. side had "put forward certain conditions for the extension", some of which "were absolutely unacceptable for us, so let us see what the Americans offer now before making any comment".
Diplomat Mikhail Ulyanov called Mr Biden's move an "encouraging step" on Twitter.
"The extension will give the two sides more time to consider possible additional measures aimed at strengthening strategic stability and global security", he tweeted.
"Russia is for preserving New START and for extending this treaty in order to gain time for talks and contacts".
U.N. Secretary-General Antonio Guterres welcomed the us decision and Russia's reiteration.
The Washington Post reported that the Biden administration, while seeking a five-year extension, is preparing to impose new costs on Russian Federation pending a newly requested intelligence assessment of its recent activities including Russia's alleged interference in the 2020 election and its massive cyberattack on US government networks.
"A five-year extension would not only maintain verifiable caps on the world's two largest nuclear arsenals but will also provide time to negotiate new nuclear arms control agreements to grapple with our increasingly complex worldwide environment", Dujarric said.
Peskov reiterated Friday that while Russian Federation "certainly stands for the preservation of New START", previous United States conditions for an extension "absolutely did not suit us".
The negotiations over New START are complicated by Mr. Biden's vows to punish Moscow for the recent SolarWinds hack and tensions with the Kremlin over meddling in the 2016 presidential race and allegations of putting bounties on USA troops in Afghanistan.
"This extension makes even more sense when the relationship with Russian Federation is adversarial as it is at this time", she said.
Asked to comment on Psaki's statement, Peskov has reaffirmed Russia's denial of involvement in any such activities.
It is the only nuclear arms control deal between the two countries still standing after Moscow and Washington withdrew from the 1987 Intermediate-range Nuclear Forces Treaty previous year.
Arms control advocates warn that the treaty´s expiry would remove checks on US and Russian nuclear forces, striking a blow to global stability.
Biden's aides have indicated that the incoming U.S. leader will work towards extending the treaty, but he also vowed to take a tougher stance on Russian Federation during the campaign.
Trump had unsuccessfully tried to widen New START to include China, whose nuclear program is growing but still far smaller than those of Russian Federation and the United States.
"Americans are much safer with New START intact and extended", John Kirby, chief Pentagon spokesman, said in a statement, adding, "We can not afford to lose New START's intrusive inspection and notification tools".
Two senior USA officials, speaking on the condition of anonymity due to the sensitive nature of the topic, told the newspaper that "Biden is ruling out a "reset" in bilateral relations with Moscow as many new US presidents have done since the end of the Cold War".