By Sabine Siebold and Matthias Williams MUNICH/KYIV (Reuters) -Reports that Ukraine has been shelling regions controlled by Moscow-backed separatists and inside the Russian border are “pure lies”, Ukraine’s president said on Saturday, adding that his country would not respond to provocations. President Voldymyr Zelenskiy was addressing senior Western security officials at the annual Munich Security Conference amid reports of explosions inside Russian territory to Ukraine’s east, and in breakaway regions of Ukraine. “What was shown yesterday in the temporarily occupied territories, some shells …