Donbas: Battle in east Ukraine expected to be bloody and decisive

APRIL 13: Hundreds of thousands of people have already fled to the relative safety of western Ukraine. Once again large columns of Russian vehicles have been spotted by satellite - this time heading towards the east.

Here in the Donbas we've also seen signs of Ukraine bringing in more military equipment, including armoured vehicles and longer range air defence systems. But not in the volume of Russia's reinforcements.