Tensions remain high in the Crimean peninsula in Ukraine as European observers were again blocked from entering the by armed men.
There was a stand-off between Ukrainian soldiers and troops, thought to be Russian, at a military base outside Sevastopol.
Two trucks of Russian-speaking armed men arrived and quickly surrounded the base.
The Ukranian commander told ITV News' Senior International Correspondent John Irvine: "They have come to protect us. So why are their guns pointing towards our base?"
The base commander was unable to contact his superiors as radio contact was blocked by a Russian signal jammer.
As John reports from inside the base, Putin's claims that these soldiers, professional in their weaponry and demeanour, are not Russian "are farcical":
John tweeted updates on the situation as it unfolded on the base:
At a Ukranian radio base outside sevastapol
lieutenant commander Yesin Alexander tells us two trucks of Russian speaking men arrived 2 hours ago http://t.co/exrlzQd1sZ
"They say they have come to protect us" he says "so why are their guns pointing towards our base?"
Inside the base the soldiers have set up rudimentary defences http://t.co/n9mv4NcJMi
A truck has parked just outside the base perimeter. Some onlookers think its radio signal jamming equipment on top http://t.co/kQH3C1id63