Brussels has issued a stark warning as tensions between the Polish and Ukrainian presidents escalate. "There is only one happy observer in this type of situation, and that's the aggressor," the European Commission said. #EuropeNews

Ukraine hits back against its NATO eastern flank backer: "only benefits Moscow."

Tusk said he has been telling European leaders that he is working to “minimize losses and reduce tensions,” admitting that “this is not an easy task.”