EUROPE 22 March 2011 Last updated at 21:44 ET By Steven EkeEditor, BBC Russian Service At the end of this week, the BBC’s Russian Service will close its radio frequencies for good. The Russian Service began broadcasting to the Soviet Union in 1946 and quickly established a reputation with Soviet listeners, in the brief period before the onset of the Cold War. From 1949 until 1987, the jamming of the signal by the Soviet authorities consumed vast amounts of money and technical expertise. For many years, a significant part of the USSR’s entire radio broadcasting system was devoted to blocking transmissions from abroad. The BBC’s Russian Service was blocked selectively and varyingly.…