Russia and Georgia "essentially at war".

BBC News:

Russian forces are locked in fierce clashes with Georgia inside its breakaway South Ossetia region, reports say, amid fears of all-out war.

Moscow sent armoured units across the border after Georgia moved against Russian-backed separatists.

Russia says 12 of its soldiers are dead, and separatists estimate that 1,400 civilians have died.

Georgia accuses Russia of waging war, and says it has suffered heavy losses in bombing raids which Russia denies.