The sister of North Korean leader Kim Jong Un has threatened to use nuclear weapons against South Korea if Seoul opts for a military confrontation with Pyongyang, the North's official media reported Tuesday.Kim Yo Jong, vice department director of the Central Committee of the Workers' Party of Korea, issued the threat after South Korean Defense Minister Suh Wook last week referred to Seoul's preemptive strike capabilities against North Korea.It was an "irretrievable very big mistake" when Suh "talked about 'preemptive strike,' terming us the enemy," Kim said in a statement carried by Korean…READ FULL ARTICLE