Ukraine crisis: What does the footage tell us?

Fierce fighting has continued in rebel-held areas of eastern Ukraine, with street clashes reported in the separatist strongholds of Luhansk and Donetsk.

More than 2,000 people have been killed since mid-April when Ukraine's government sent troops to put down the rebel uprising and local authorities in Donetsk have reported the deaths of 34 civilians in the past 24 hours alone.

However, the fighting may intensify further after the Ukrainian government claimed that armoured vehicles from inside Russia have recently joined the battle for Luhansk.

Jonathan Marcus examines what the latest footage tells us about the battle for Ukraine.