SEOUL (AFP/Reuters) - North Korea on Tuesday accused the United States and South Korea of carrying out more than 1,100 spy plane missions this year amid mounting tensions over the communist states nuclear programmes. The Norths Korean Central News Agency, quoting what it called a military source, said US and South Korean spy planes had made dozens of flights conducting aerial reconnaissance over the North in June alone. The US imperialist aggressor forces committed more than 110 cases while the South Korean puppet army at least 90 cases in June, bringing the total number of cases of aerial espionage against the DPRK to more than 1,100 cases in the first six months of the year, KCNA said, quoting the source. The deputy head of US forces in South Korea in early June said they would deploy unmanned spy planes to keep a closer watch over nuclear-armed NKorea. North Korea on May 25 staged its second nuclear test. It followed up by renouncing the armistice in force for more than 50 years on the peninsula, firing six short-range missiles and threatening the South with possible attack. Pyongyang is also thought to be preparing to test medium-range missiles and a long-range Taepodong-2. Meanwhile, the US Treasury said on Tuesday it has targeted an Iranian-based firm for its ties to North Koreas missile proliferation network, a move that bans US companies from dealing with it. Hong Kong Electronics, located in Kish Island, Iran, has been named for transferring millions of dollars of proliferation-related funds to North Korea from Iran. North Korea uses front companies like Hong Kong Electronics and a range of other deceptive practices to obscure the true nature of its financial dealings, making it nearly impossible for responsible banks and governments to distinguish legitimate from illegitimate North Korean transactions, said Stuart Levey, undersecretary of the treasury for terrorism and financial intelligence. Treasury said Hong Kong Electronics provided support to North Koreas Tanchon Commercial Bank and Korea Mining Development Trading Corporation (KOMID). Since 2007 Hong Kong Electronics has transferred funds to North Korea on behalf of KOMID, Treasury said. Tanchon, a bank based in Pyongyang, North Korea, is the financial arm for KOMID, North Koreas premier arms dealer and main exporter of goods and equipment related to ballistic missiles and conventional weapons, Treasury said. The actions were taken under an executive order that allows the US government to freeze assets of designated proliferators of weapons of mass destruction and their supporters and isolates them from the US financial and commercial systems.