Continued from page 1

It was just a few days after a warm 2010 visit between Russian President Dmitry Medvedev and Mr. Obama — the two men ate cheeseburgers together in a Washington restaurant — that U.S. authorities announced charges against 11 undercover Russian agents living in the United States.

That case was resolved rapidly by a quid pro quo deal in which the agents were handed back to Moscow in exchange for the release of four individuals who had been jailed by Russian authorities.

Mr. Ventrell, when asked whether a similar exchange might be in the works with regard to Tuesday’s arrest in Moscow, said, “This is something that happened overnight. I don’t have any information about reciprocity or anything to provide here.”