Captured during the Korean War and imprisoned for decades for refusing to renounce his communist beliefs, 95-year-old Ahn Hak-sop now has a single dying wish: to return to North Korea and be buried alongside his comrades.

The powerful sister of North Korean leader Kim Jong Un said her country will never see South Korea as a partner for diplomacy.

Kim said the "security environment" around North Korea is "getting more serious day by day" and "requires us to make a radical and swift change in the existing military theory and practice and rapid expansion of nuclearization," the official Rodong Sinmun newspaper reported, paraphrasing his remarks.