MOSCOW, June 19 (Reuters) - Moscow sees the downing of a Syrian government warplane by the United States as an "act of aggression and support of terrorists", TASS news agency quoted Russian Deputy Foreign Minister Sergei Ryabkov as saying on Monday.

(Reporting by Maria Kiselyova; Writing by Dmitry Solovyov) ((dmitry.solovyov@thomsonreuters.com))