On Friday, a press secretary of the Ukrainian special forces told the BBC that he had referred only to the areas in the Kursk region, where his forces fought.
The secretary -secretary did not say how long this line was.
And although this is not a complete picture, it suggests significant losses in North Korea.
Separately, The New York Times also reported that the North Koreans had been removed from the lines.
The newspapers quote US officials who say the conclusion may not be permanent, and soldiers can return after receiving additional training or after the Russians come up with new ways to deploy them to avoid such difficult casualties.
The reports related to South Korean intelligence states that the North Koreans are not ready for the realities of the modern war and especially vulnerable to target Ukrainian drones.
Russian President Vladimir Putin and North Korean leader Kim Jong Un has deepened bilateral ties in recent months by signing a security and protection agreement.
Pyongyang’s assistance in Moscow also extends to a large number of ammunition and weapons.
Last August, elite Ukrainian troops launched a lightning attack in Kursk, capturing more than 1000 square km (386 square miles) of the Russian territory.
Since then, the Russian forces have managed to return a significant piece of the region.
Kiev’s surprise was aimed at changing the dynamics of the war.
Initially, the operation would lift the pressure on other parts of more than 1000 km (620 miles) front, especially in eastern Ukraine.
Moscow continues its tireless – albeit slowly – promotion in the East, seizing a number of settlements in the Donetsk region in recent weeks.
Now Kyiv is looking for the land it occupies in Kursk as leverage for any possible stopped fire or peace talks with Moscow.
In February 2022, Russia launched a full -scale invasion of Ukraine.
