[Subtitle:] Barack Obama knew about the FBI operation to arrest an alleged spy ring before meeting his Russian counterpart Dmitry Medvedev last week, but did not raise it at the talks, according to the White House.Robert Gibbs, the White House spokesman, said the revelations, which were condemned by Russia, would not interfere with the effort by both sides to "reset" their relations, which has been pursued ever since Mr Obama became president last year. . .