Russian diplomats in North Korea were negotiating with a man who shot and killed three guards and then broke into Moscow's trade mission in Pyongyang, the capital, and demanded political asylum. "Contact has been established with the intruder, and we are examining the motives which pushed him to this move," said Albert Chernyshev, Russia's deputy foreign minister. The man, armed with a pistol, was threatening to commit suicide in the mission unless he was granted asylum, Russian diplomats said. In Moscow, the Foreign Ministry said it was considering his request. The Itar-Tass news agency identified the intruder as a 25-year-old security guard at unidentified sensitive installations of the North Korean Communist Party. It said he demanded that a Russian representative remain with him constantly.