As leaders meet in Bratislava to try to stop EU fragmentation, Ukraine has highlighted Russia’s role in trying to “shatter” the bloc.“I strongly believe that every threat you will discuss - ongoing migration waves, large-scale propaganda and misinformation, rising populism and right-wing extremism, undermining of values and instigation of N-exits - are all servants of Russia’s hybrid warfare”, Ukrainian president Petro Poroshenko said in a letter, seen by EUobserver, to EU institutions and capitals on Thursday.