MOSCOW, May 18 (Reuters) - Russia has picked Gazprombank, Sberbank CIB and VTB Capital as organisers for a sovereign Eurobond issue in 2021, the finance ministry said on Tuesday. (Reporting by Andrey Ostroukh, Maxim Rodionov and Darya Korsunskaya, editing by Louise Heavens) Our Standards: The Thomson Reuters Trust Principles.