How will Russia attack Ukraine's new front lines?

The conflict in Ukraine has shifted to the east of the country where Ukrainian forces are battle-hardened and well-prepared.

Analysts believe Ukraine's best units are in the east, and that they are dug into trench systems and other fortified positions.

So far, Ukrainian troops have strongly resisted the Russian advance, but they could be heavily outnumbered by Russian forces who are inching forwards in some areas.

Where will the key battles be fought?

Russian officials have said that the focus of its forces is now the "complete liberation" of the...