The ministers will hold talks with the International Criminal Court's Prosecutor-General Karim A.A. Khan as Western pressure mounts to hold to account those responsible for any war crimes in Ukraine.

EU foreign policy chief Josep Borrell, who is chairing Monday's meeting in Luxembourg, deplored what he called the ``brutal, brutal aggression'' of Russian troops.

Borrell, who was in Ukraine over the weekend, says further EU sanctions against Russia ``are always on the table.''

He says he's ``afraid the Russian troops are massing on the east to launch an attack on the Donbas,'' region in the east after Moscow withdrew its forces from around the capital Kyiv last week.