The sources said Maria Shulskene was invited to go by a friend. She was herself born in the United States and lived in Brooklyn until she was five years old. they added. Her son was sentenced to 10 years in May. 1971. for treason. In November the previous year. U.S. Coast Guardsmen handed him back to his Soviet trawler after he jumped on to their cutter in an attempt to defect. The sources said Mrs. Shulskene. who had not received any letters from her son in his Ural labor camp since last September. handed her papers and the invitationstamped by a U.S. notarys officeto visa authorities in Lithuania in March.