NATO has said it's looking into reports that Russian military vehicles may have crossed the border.
"If confirmed, they are further evidence that Russia is doing the very opposite of what it's saying. Russia has been escalating the conflict, even as it calls for de-escalation," alliance spokeswoman Oana Lungescu said.
"Russia needs to pull back its troops, stop the flow of arms and fighters over the border with Ukraine, stop supporting the separatists, and engage in a genuine and sincere dialogue with Ukraine," she told Reuters.
More in our latest news wrap...
Philip Hammond: urge the Russians to withdraw any military personnel they have inside #Ukraine & stop supporting the separatists
— Foreign Office (FCO) (@foreignoffice) August 15, 2014
My day's work - chased a humanitarian convoy that stopped short of border, stumbled upon an actual mini-invasion. http://t.co/RPHO82Q5A2
— Shaun Walker (@shaunwalker7) August 14, 2014
In Russian posh supermarket Azbuka Vkusa today, herring from Belarus. From Belarus? It doesn't have any sea.
— Daniel Sandford (@BBCDanielS) August 15, 2014
I just listened to Rossia24 cuts from Putin's ystrday speech&am convinced it was hastily written, unrehearsed. Not the speech he planned.
— Robert Coalson (@CoalsonR) August 15, 2014
Reuters: #Lithuania cites reports of Russian military equipment crossing into #Ukraine http://t.co/RnNkwRyQ7K pic.twitter.com/9nDqF4qzdM
— Kyiv Post (@KyivPost) August 15, 2014
RT @BBCDanielS Laurent Corbaz of ICRC says implementing aid agreement between Russian and Ukraine will take a week and maybe "much longer"
— Ian Bateson (@ianbateson) August 15, 2014
Ukraine says it doesn't have right paperwork to inspect Russian convoy. That's a joke I hope. Insanity rules while troops get killed
— bruce springnote (@BSpringnote) August 15, 2014