LONDON/BERLIN (Reuters) -Ukraine has scrapped its "sponsors of war" blacklist, the centrepiece of its campaign to pressure companies doing business in Russia, the agency in charge said on Friday after a backlash from countries from Austria to China. The end of the blacklist, which has embarrassed around 50 major companies identified as operating in Russia and indirectly helping the Kremlin's war in Ukraine, represents a climbdown by Kyiv as it seeks to maintain fragile international support.