President Dmitry Medvedev on Thursday welcomed the U.S. Senate’s decision to ratify a landmark U.S.-Russian nuclear arms control treaty, but Russian legislators said they need to study a resolution accompanying the document before following suit.

Medvedev’s spokeswoman Natalya Timakova said that when Mr. Medvedev signed the New START treaty with President Barack Obama, they agreed that the ratification process should be conducted simultaneously.

She said that Mr. Medvedev voiced hope that both houses of Russian parliament would ratify the pact, but added that they would need some time to analyze the Senate’s conditions for its ratification before making their decision.

The New START treaty, signed by Mr. Obama and Mr. Medvedev in April, would limit each country’s strategic nuclear warheads to 1,550, down from the current ceiling of 2,200. It also would establish a system for monitoring and verification. U.S. weapons inspections ended last year with the expiration of a previous arms control deal.

Legislators in the Kremlin-controlled parliament had said before the Senate landmark ruling on Wednesday that they would approve the treaty quickly after it is ratified in the U.S.

Lower house speaker Boris Gryzlov, however, told reporters on Thursday that the Senate’s ratification resolution apparently contained some conditions and the legislators need to carefully study the text before making their decision.

He added that the State Duma may ratify the pact on Friday if the text of the treaty itself remained unchanged.

“If these conditions don’t change the text of the treaty, we may pass a ratification bill even tomorrow,” Mr. Gryzlov said.

He said that the house would need more time if it finds any changes in the body of the treaty.

Conservative Republicans said the pact would limit U.S. options on missile defense, lacked sufficient procedures to verify Russia’s adherence and deserved more time for consideration.

Mr. Obama called the treaty a national security imperative and pressed strongly for its approval before Congress, with a Republican majority, assumes power in January. In recent days, he had telephoned a handful of wavering Republicans, eventually locking in their votes.

The Obama administration has argued that the United States must show credibility in its improved relations with its former Cold War foe, and the treaty was critical to any rapprochement. The White House is also counting on Russia to help pressure Iran over its nuclear ambitions.

Republicans had tried to kill the treaty by forcing changes in its language that would have sent it back for negotiations with Moscow. Democrats sought to appease some Republican senators by letting them raise these issues in legislation accompanying the treaty that would not directly affect the pact.

On Wednesday, two such amendments, one on missile defense and one on funding for the U.S. nuclear arsenal, passed with support from both parties.

Konstantin Kosachev, the head of the Duma’s foreign affairs committee, said that decision is conditioned on the analysis of the amendments.

“We realize that the process shouldn’t be delayed, but we intend to work in such a way that it doesn’t affect the quality,” he said.

Mr. Kosachev said that the Duma may quickly approve the pact on Friday without any conditions, or could decide to include some conditions of its own, which could delay the vote.

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