Josep Borrell described his decision as a symbolic consequence of Prime Minister Viktor Orban's trip to Moscow earlier this month to discuss peace with Russian President Vladimir Putin without the approval of his EU partners.
He said that each EU member state has the right to choose its foreign policy, but must loyally align itself with the common foreign policy position.
Josep Borrell said that the EU wants peace in Ukraine, but that a lasting and just peace requires guaranteeing Ukraine's sovereignty and holding the perpetrators of war crimes to account.