North Korean leader Kim Yo-jong's sister said that the US-South Korea agreement to strengthen nuclear deterrence against Pyongyang will increase insecurity in the world.

Iran PressAsia: Kim Jong-un's sister Kim Yo-jong says an agreement from a US-South Korea summit will make insecurity worse, state media KCNA reports.

North Korea is convinced it must further perfect a "nuclear war deterrent" as a result, Kim said.

Kim's statement is North Korea's first comment on the meeting, and suggests its cycle of military shows of force and weapons development will continue.

US President Joe Biden and South Korean President Yoon Suk Yeol met this week, with the United States pledging to give South Korea more insight into its nuclear planning over any conflict with North Korea amid anxiety over Pyongyang's growing arsenal of missiles and bombs.

A US Navy nuclear-armed ballistic missile submarine will also visit South Korea for the first time since the 1980s, to help demonstrate Washington's resolve to protect the country from a North Korean attack. 219