Russia and Ukraine's mystery tanks - by Jonathan Marcus

The Russian government has strenuously denied that any of its tanks crossed the border into Ukraine.

But now Nato has released satellite imagery, linked to existing video material, which appears to give added weight to assertions from the Ukrainian authorities that the tanks used by separatist forces that crossed into its country just a few days ago were indeed supplied by the Russians.

There is no doubt that the mystery tanks were on the road inside Ukraine.

Two of them were seen driving through the town of Makiivka, near Donetsk, and another was seen in Snizhne, further east.

Nato has provided two pictures from open-source video that show the T-64 tanks at the two locations.

Read More: BBC News - Russia and Ukraine's mystery tanks