An airborne assault by Russian paratroopers using dozens of helicopters has seized a cargo airfield to the north-west of the capital. Ukrainian forces have fought back with the limited array of armour and missiles at their disposal. Aircraft have been shot down; tanks have been burned out; civilians killed and injured. In what so far seems like a pinnacle of willed madness, Russian and Ukrainian troops were reported to be fighting over control of the Chernobyl nuclear power station.