Poland's goals at EU summit achieved - Polish PM

German Defence Minister Ursula von der Leyen has been backed to become president of the executive European Commission. /PAP/EPA

"Poland's goals at the EU summit have been achieved. We have shown that we need candidates, who have the potential to unite instead of antagonise," the Polish PM Mateusz Morawiecki said after the end of the summit in Brussels.

European Union leaders have broken three days of deadlock and nominated new heads for the 28-nation bloc's institutions.

European Council President Donald Tusk said in a series of tweets on Tuesday that German Defence Minister Ursula von der Leyen has been backed to become president of the executive European Commission, and Belgian Prime Minister Charles Michel the head of the European Council.

Frenchwoman Christine Lagarde has been nominated as the head of the European Central Bank and Spanish Foreign Minister Josep Borrell as EU foreign policy chief.