MOSCOW (Reuters) - Russian Prime Minister Dmitry Medvedev was quoted as saying on Thursday sanctions must be abandoned to overcome problems in relations with the West after meeting U.S. President Barack Obama on the sidelines of a meeting in Asia. It is necessary "to abandon sanctions, move relations to a normal, working order, return to normal, calm, productive talks", Interfax news agency quoted Medvedev as saying in Myanmar, where he is attending a summit of the Association of Southeast Asian Nations. ...