Ukrainian servicemen ride in a tank close to the airport in the eastern city of Donetsk, a facility which has been the site of intense fighting for several weeks.
The first pictures are emerging of Ukrainian servicemen killed when separatists shot down their plane near Luhansk. 49 troops and crew died in the incident, the deadliest yet in the conflict in eastern Ukraine.
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Ukraine's foreign ministry says the mob that smashed diplomatic vehicles outside the Russian embassy in Kyiv were "provocateurs."
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Meanwhile, Ukraine scrambles to tackle a growing refugee crisis
The evidence shown comes from Nato military sources and is not necessarily conclusive. But, despite Russian denials, it is strongly suggestive of the narrative that Nato is setting out.
It should be noted that Russian spokesmen have denied a number of things in regard to operations in Ukraine which have turned out to be untrue.
A senior Nato officer told the BBC, that the images "raise significant questions concerning Russia's role in facilitating instability in eastern Ukraine".
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Pro-Kyiv military blogger Dmitry Tymchuk says via Facebook that the Luhansk airport was attacked twice overnight, including with a grenade launcher, but that Ukrainian forces returned fire and did not sustain casualties.
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Here are some images from the unrest outside the Russian Embassy in Kyiv, where the protest turned ugly when a Molotov cocktail was thrown and struck an exterior wall of the building. Some windows were also broken, sparking angry responses from Moscow.
A fireman extinguishes the flames from a Molotov cocktail thrown into the embassy complex.
A protester ties his shoelaces on an overturned car.
A protester holds a sign reading "Russia is a killer."
