A California man has been sentenced to eight years in prison after admitting to shipping weapons and ammunition to North Korea that he said were to be used for a surprise attack on South Korea, authorities said Tuesday.

A Chinese national has been sentenced to eight years in prison for smuggling firearms and other military items to North Korea, the US justice department said. Shenghua Wen, 42, received around $2m (£1.5m) from North Korean officials to ship the items from California, according to a statement from the agency on Monday.

A Chinese national will spend nearly 10 years in prison for conspiring to smuggle weapons and sensitive U.S. technology to North Korea and accepting million-dollar bribes.

North Korea is stepping up criticism of South Korea's new President Lee Jae Myung as he prepares for his first summit with U.S President Donald Trump, calling Lee's efforts to engage with Pyongyang a "pipedream".

Kim Yo Jong, sister of North Korea's leader Kim Jong Un, arrives at the Vostochny Сosmodrome before a meeting of Russia's President Vladimir Putin with North Korea's leader Kim Jong Un, in the far eastern Amur region,

North Korean leader Kim Jong Un condemned South Korean-U.S. military drills and vowed a rapid expansion of his nuclear forces to counter rivals, state media said Tuesday, as he inspected his most advanced warship being fitted with nuclear-capable systems.