Mrs Merkel was speaking after holding talks with Russian President Vladimir Putin in the Black Sea city of Sochi
.
Earlier this month Moscow stopped pumping oil along a pipeline through Belarus in a dispute with Minsk
.
Last year gas supplies were stopped for several days in a dispute with another transit country, Ukraine
.
Mrs Merkel, whose country holds the six-month EU presidency, did not pull her punches when it came to the vital issue of energy security
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