North Korea has opened an exhibition of its latest weapons in Pyongyang, with leader Kim Jong Un vowing to counter "real and serious" U.S. threats by bolstering its military and technological development, state-run media said Sunday.Kim said in the opening ceremony of the Defense Development-2025 on Saturday that the event "features the recent results of the important projects" the country has implemented to put the structure of its military capabilities on "an increasingly modern, advanced footing" with "its nuclear deterrent as the backbone."Photos released by the official Korean Central …READ FULL ARTICLE