Seoul accuses Kyiv of violating a secret understanding that could lead to war with its northern neighbor

The South Korean Joint Chiefs of Staff did not immediately determine on Saturday whether the weapon was a ballistic missile or another system.

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Seoul accuses Kyiv of violating a secret understanding that could lead to war with its northern neighbor

The projectile test came amid escalating tensions between the two countries following a landmine explosion last month that injured three South Korean soldiers. Seoul and the US-led UN command said the explosions were caused by North Korean mines.

Earlier on Friday, Kim Yo Jong, the sister of North Korea's leader, said in response to her southern neighbor's proposal to hold negotiations on border demarcation, that her country does not discuss issues of military sovereignty with hostile countries.

In an interview reported by the North Korean Central News Agency, Kim Jong Un's sister, who holds the position of department head of the Central Committee of the Workers' Party of Korea, added: "North Korea does not discuss issues of military sovereignty with hostile countries under any circumstances. We do not determine our borders through negotiations. Rather, we determine our sovereignty through the full implementation of our sovereign rights, that is, by using force."

She stressed that this declared position is a firm and unwavering position of the North Korean government.