kiev ukrainian president petro poroshenko say thursday eu decision extend economic sanction russia important political decision behalf country eu announce six-month extension early day sanction impose retaliation russia annexation ukraine crimean peninsula 2014 back separatist rebel ukraine eastern donbass region important political decision leaders european union continue economic sanction russia violate ukraine territorial integrity unwillingness stop hybrid aggression country poroshenko write official facebook page ukraine leader welcome eu 's extension sanction russia