SEOUL (AFP) - Following North Korea's declaration that it is in a "state of war" with South Korea, here is a fact box on the relative conventional strengths of the three militaries present on the Korean peninsula. The figures are taken from the London-based International Institute of Strategic Studies' annual global "Military Balance" report, 2011.

        N Korea    S Korea (+ US forces)

GROUND FORCES

Active troops    1.2 m    655,000 (+ 28,000)

Reserves/Paramilitaries    5-7.7m    3m

Tanks         4,100    2,400 (+ 50)

Armoured personnel carriers    2,500    2,600 (+ 110)

Field artillery pieces    8,500    5,200 (+ 16)

Multiple rocket launchers    5,100    200 (+ 40)

Mortars        7,500    6,000

Air Defence Guns    11,000    300

AIR FORCES

Combat aircraft    820 (620 serviceable)    460 (+ 90)

Helicopters        300    680 (+ 120)

NAVAL FORCES

Principle combat vessels    3        19

Patrol and coastal vessels    383    111

Submarines        70    23

Hovercraft        135    5

Landing ships and craft    130    41