North Korea: Kim Jong Un's sister Kim Yo Jong hurls insults at 'idiot' South Korean leaders over possible sanctionsKim Yo Jong, sister of North Korean leader Kim Jong Un, called the South Korean president and his government "no more than a running wild dog gnawing on a bone given by the US".Seoul is also considering taking action against alleged cyber attacks by North Korea, believed to be an important new source of funding for its weapons programme, if the secretive state carries out a major provocation like a nuclear test.Responding to Ms Kim's insults, Seoul said it was "very deplorable for her to denounce our head of state with rough, substandard words and show no basic forms of etiquette".Ms Kim's official title is vice department director of the Central Committee of the North's ruling Workers' Party, but South Korea's spy agency has said that she handles relations with both South Korea and the US.Both China and Russia backed tighter sanctions after Pyongyang's last nuclear test in 2017, but in May vetoed a US-led push for more UN penalties over its renewed missile launches."