File photo: Seized Ukrainian ships, small armoured artillery ships and a tug boat, are seen anchored in a port of Kerch
Photograph: PAVEL REBROV
A Ukrainian diplomat was seen entering the Russian foreign ministry on Monday, RIA news agency reported, hours after Moscow promised to summon a Ukrainian representative to discuss an incident in the Kerch Strait on Sunday.
Russia seized two small Ukrainian armoured artillery vessels and a tug boat, which Moscow said had illegally entered Russia's territorial waters. Kiev said its vessels did nothing wrong and has accused Russia of military aggression.
Three Ukrainian naval vessels seized by Russia off the coast of Russia-annexed Crimea on Sunday are being held at the Black Sea peninsula's port of Kerch, witnessed said on Monday. 
ReutersThree Ukrainian ships seized by Russia are moored at Crimean port of Kerch