The warnings from Seoul came after North Korea’s Kim Yo Jong, sister of leader Kim Jong Un, accused the South Korean military of endangering North Korean soldiers by firing warning shots during Pyongyang’s work to fortify the border. The escalation and exchange of threats has raised the possibility of clashes along the heavily armed border. Key points and original sources are listed below.

• The warnings from Seoul came after North Korea’s Kim Yo Jong, sister of leader Kim Jong Un, accused the South Korean military of endangering North Korean soldiers by firing warning shots during Pyongyang’s work to fortify the border.S1

• The escalation and exchange of threats has raised the possibility of clashes along the heavily armed border.S2