BBC: Ukraine accuses Russian troops of attacking its forces
WNU Editor: The situation in Ukraine is unraveling .... Ukrainian leader cuts short Davos visit as situation 'worsens' (AFP).
More News On The Ukraine Conflict
Ukraine Accuses Russia of Sending More Troops and Artillery to Aid Rebels -- New York Times
Ukraine Says Russian Troops Join Separatists in New Assaults -- Bloomberg
Ukraine says its forces come under attack from Russian troops -- Reuters
'Russian forces' attack Ukraine troops in separatist east -- AFP
Kyiv Says Russian Military Attacked Its Forces Inside Eastern Ukraine -- VOA
Ukraine military accuses Russia of direct attack on its forces -- Euronews
Ukraine Reports Attack By Russian Troops On Eve Of Talks -- Radio Free Europe
Ukraine accuses Russia of firing on troops near Donetsk -- Deutsche Welle
Russian forces, equipment enter Ukraine, PM says -- CNN
Ukraine Conflict: Kiev Claims It's Threatened By Rebel Air Power Backed By Russia -- IBTimes
Ukraine faces threat of Russian air power as conflict takes turn for the worse -- Kyiv Post
Claims that Russian forces entered Ukraine 'complete rubbish,' Russia says -- CNN
Russia denies new Ukraine troop incursion as civilian casualties mount -- Euronews
Hospital and university hit as Ukraine clashes flare -- AFP
Fighting Has Flared Up in Ukraine, Raising Fears of All-Out War Once Again -- Time
Ukraine calls up 50000 reservists after sharp escalation in hostilities -- The Telegraph
Ukraine conflict: Security in east deteriorating, say observers -- BBC
As fighting deepens in eastern Ukraine, death toll rises -- Washington Post
The Guardian View of war in Ukraine: maintain the pressure on Russia -- Guardian editorial