North Korea just don't have that capacity:-
http://en.wikipedia.org/wiki/Korean_People's_Army#Capabilities
Although the North Korean military once enjoyed a startling advantage against its counterpart in South Korea, its relative isolation and economic plight starting from the 1980s has now tipped the balance of military power into the hands of the better-equipped South Korean military.[6] In response to this predicament, North Korea relies on asymmetric warfare techniques and unconventional weaponry to achieve parity against high-tech enemy forces.[6] North Korea has developed a wide range of technologies towards this end, such as stealth paint to conceal ground targets,[30] midget submarines and human torpedoes[31] and a vast array of chemical and biological weapons.[32] The Korean People's Army also operates ZM-87 anti-personnel lasers, which are banned under the United Nations Protocol on Blinding Laser Weapons.[33]
Since the 1980s, North Korea has also been actively developing its own cyber warfare capabilities, and as of 2011 has some 1,000 skilled military hackers.[34][6] The Korean People's Army has also made advances in electronic warfare by developing GPS jammers.[35] Current models include vehicle-mounted jammers with a range of 50 kilometres (31 mi)-100 kilometres (62 mi). Jammers with a range of more than 100 km are being developed, along with electromagnetic pulse bombs.[36] The Korean People's Army has also made attempts to jam South Korean military satellites.[37]
A KPAF Ilyushin Il-76MD strategic airlifter in the mid-2000s, in Air Koryo markings.
Despite the general fuel and ammunition shortages for training, it is estimated that the wartime strategic reserves of food for the army are sufficient to feed the regular troops for 500 days, while fuel and ammunition - amounting to 1.5 million and 1.7 million tonnes respectively - are sufficient to wage a full-scale war for 100 days.[38]
The KPA does not operate aircraft carriers, but has other means of power projection. Korean People's Air Force Il-76MD aircraft provide a strategic airlift capacity of 6,000 troops, while the Navy's sea lift capacity amounts to 15,000 troops.[39] The Strategic Rocket Forces operate more than 1,000 ballistic missiles according to South Korean officials.[40] North Korea acquired 12 Foxtrot class and Golf-II class missile submarines as scrap in 1993.[41] Some analysts suggest that these have either been refurbished with the help of Russian experts or their launch tubes have been reverse-engineered and externally fitted to regular submarines or cargo ships.[42] In both cases, the KPA would be within a proposed firing range of islands in the central Pacific Ocean and the Western coast of North America.[41]
A photograph of Kim Jong Un receiving a briefing from his top generals on March 29, 2013 revealed the military had a minimum of 40 submarines, 13 landing ships, 6 minesweepers, 27 support vessels and 1,852 aircraft.[43]
