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Mr. Hagel said he was committed to keeping Congress informed.

Rep. Mike Rogers, Alabama Republican and chairman of the House Armed Services strategic forces subcommittee, wrote a letter to Mr. Biden this week trying to ascertain the administration’s plans, as first reported by Foreign Policy magazine.

“Ahead of your unannounced discussions with Russian Foreign Minister Lavrov this weekend in Munich, and prior to Mr. Donilon’s forthcoming February discussions in Moscow, I write seeking your assurance as to President Obama’s plans for future potential U.S. arms reductions,” Mr. Rogers wrote.

The lawmaker reminded the vice president that, as a senator in 2002, Mr. Biden urged the Bush administration to follow the precedent that “with the exception of the SALT I agreement, every significant arms-control agreement during the past three decades has been transmitted to the Senate pursuant to the Treaty Clause of the Constitution.”

After a protracted fight in 2010, the Senate ratified the New START, a U.S. pact with Russia to reduce deployed, long-range nuclear warheads by up to 30 percent on each side.

Mr. Biden’s trip will begin in Berlin, where he will meet with German Chancellor Angela Merkel. He will address the Munich Security Conference on Saturday before departing with Mrs. Biden for Paris and London, where the vice president will hold meetings with French President Francois Hollande and British Prime Minister David Cameron.