Video has emerged of the tense moment Ukrainian and Russian officers met to discuss the stand-off at Belbek airport in Sevastapol, Crimea.
In the clip, both officers appear to urge calm amongst their own men, amid fears of escalation.
A soldier carrying the Ukrainian flag approached the two men and is warned off by the officers and a Russian soldier.
Pro-Russia activists recaptured administrative headquarters in the Ukrainian city of Donetsk and flew the Russian flag from its roof.
ITV News' Europe Correspondent describes the tense atmosphere surrounds a central government building in Donetsk .
New footage obtained by ITV News shows Russian troops firing warning shots as Ukrainian soldiers approached during a tense stand-off today.