North Korean leader Kim Jong Un boasts of removal of 'filth' after execution of uncle Kim's comments in an annual New Year's message, including those focusing on one of the biggest political developments in Pyongyang in years, and certainly since the young leader took power two years ago after the death of his father, Kim Jong Il, will be closely scrutinised by outside analysts and governments for clues about the opaque country's intentions and policy goals. North Korea has also vowed to restart nuclear bomb fuel production. The country conducted its third nuclear test in February and is estimated to have a handful of crude nuclear devices and to be working toward building a warhead small enough to mount on a long-range missile. Most experts say that goal may take years to achieve. The rival Koreas share one of the world's most heavily armed borders, with hundreds of thousands of combat-ready troops facing each other along the mine-strewn Demilitarised Zone. The 1950-53 Korean War ended with an armistice, not a peace treaty, leaving the peninsula technically in a state of war. About 28,500 American troops are deployed in South Korea to help deter North Korean aggression. During his two years in power, Kim Jong Un has overseen nuclear and missile tests, other high-profile purges and a barrage of threats. His father took a much more low-profile approach when he took over after Kim Il Sung's 1994 death. Kim Jong Un, who also spoke publicly last New Year's Day, appears to be following in his grandfather's steps, the country's founder Kim Il Sung, who gave public New Year's readings on state television and radio until his 1994 death. Under the more private Kim Jong Il, the North's leading newspapers released the annual statement in a joint editorial. Edited by Steve Wilson