North Korean leader Kim Jong Un has paid an emotional tribute to soldiers who have died fighting for Russia in its war against Ukraine, saying his ‘heart aches’ in a rare admission of military losses.

Just 27 kilometres away from its border with China, North Korea has a secret missile base in Singpung. This facility, which is larger than New York’s John F Kennedy International Airport, is rumoured to house six to nine of the country’s most advanced intercontinental ballistic missiles.