The North Korean leader’s influential sister threatened “terrible and fatal” retaliation against Seoul on Tuesday, following South Korea and Ukraine’s recent allegations that Pyongyang has dispatched troops to support Russia’s invasion.

In a statement released through the state-owned Korean Central News Agency on Tuesday evening, Kim Yo Jong accused the two countries of provoking “nuclear weapons states,” without specifying what actions have drawn Pyongyang’s ire.

“A military provocation against a nuclear weapons state may lead to a horrible situation, unimaginable for politicians and military experts in any big or small country in the world with their normal thinking to experience,” she warned.

“Seoul and Kyiv are exact counterparts in going about begging and letting loose reckless remarks against nuclear weapons states at random without follow-up capability.”

Kim’s condemnation of the two countries as “bad dogs bred by the U.S.” comes after the two accused the DPRK of deploying thousands of troops to support Russia’s invasion of Ukraine in recent weeks.

South Korea’s National Intelligence Service claimed on Friday that North Korea already dispatched over 1,500 special forces troops to Russia between Oct. 8 and 13, with more deployments expected in the near future.

A senior Ukrainian military official subsequently called on Seoul to take advantage of North Korea sending its “most powerful troops” and seize the “chance to permanently end the division” between the two Koreas.

“It is also a chance for the whole of East Asia to safeguard itself from a neighbor with a nuclear button,” Bohdan Krotevch, acting commander of the National Guard of Ukraine’s Azov Brigade, said on social media on Saturday.

Although Kim’s meandering statement did not specifically reference the ROK spy agency’s claims, her focus on both Seoul and Kyiv appears to be a response to the allegations, which Pyongyang has denied.

The North Korean ruling party vice department director also condemned South Korea for allegedly dropping leaflets critical of the Kim Jong Un regime north of the border using drones.

Pyongyang previously accused Seoul’s military of scattering the propaganda leaflets in North Korea on Oct. 3, 9 and 10, and Kim said DPRK authorities discovered more “political motivational rubbish sent by the ROK scum” on Monday.

North Korean state media has published photos of an alleged ROK military drone found in Pyongyang, though experts have suggested Pyongyang could have faked the evidence.

Kim stated that North Korean investigators are continuing to look into the alleged drone incursions, and threatened to retaliate against South Korea for its “hideous military provocation.”

“Seoul will have to experience firsthand so as to know properly how dangerous an act it committed and how terrible and fatal the consequences it brought on itself are.”

She added: “No one knows how our retaliation and revenge will be completed.”

Edited by Alannah Hill