The United States and South Korea have conducted more than 2,200 cases of aerial spying against the Democratic People's Republic of Korea (DPRK) so far in 2008, the official KCNA news agency quoted a military source as saying on Tuesday.

It proved that the United States and South Korea have stepped up their preparations for invading the DPRK, the KCNA said.

In December, the United States committed at least 110 cases and South Korea more than 70 cases, the military source said.

The KCNA reports U.S. and South Korean spying flights monthly. A total of 2,250 cases of such espionage were reported in 2007.

(Xinhua News Agency December 30, 2008)