Ukraine President Pyotr Poroshenko has delivered what may be a final warning to European countries backing Russian gas monopoly Gazprom's plans to build the Nord Stream 2 gas pipeline across the Baltic Sea, writes Vladimir Afanasiev.
A Russian military offensive against Ukraine in 2014 saw the Crimea Peninsula annexed, and two of its eastern regions, Donetsk and Luhansk, taken by pro-Russian separatists, backed military and financially from Moscow.
