European Union foreign ministers have expressed "deep concern" at Russia's "aggression against Ukraine", as the bloc's leaders prepare to consider new sanctions on the Russian government.
Speaking after the ministerial meeting in Milan, EU foreign policy chief Catherine Aston urged Russia to "withdraw its forces from Ukraine".
EU leaders are arriving in Brussels to consider their response to the crisis.
Russia denies that its forces are backing rebels in eastern Ukraine.
But Baroness Ashton said there was "deep concern" over "direct aggression by Russian forces". She called on Russia to stop the flow of arms, equipment and personnel into Ukraine.
It's not just concern, it's deep concern.