”North Korean military casualties: 4,000...1,000 deaths” = South Korean report

The British public broadcaster BBC reported on the 22nd (local time) that the death toll of North Korean troops dispatched to Russia's invasion of Ukraine has reached over 1,000. Including the injured and missing,
The BBC reported on the same day, citing multiple Western sources, that of the 11,000 North Korean troops deployed to the Kursk region in western Russia, 4,000 had been killed by the end of this month.
The death toll was reported to be around 1,000. If the injured and missing are added, the total number is over 4,000, approaching 40% of the North Korean military's total deployed forces.
Regarding this, the BBC said, "The North Korean military has suffered greater troop losses than expected."
The analysis is that the North Korean military is rapidly losing its fighting power. The BBC reports that North Korean leader Kim Jong Eun has announced that he will leave Russian territory and leave Ukraine ahead of ceasefire talks between Russia and Ukraine.
He was helping to drive out the army and such heavy troop losses told him "a heavy cost is being incurred."
Meanwhile, Ukrainian President Volodymyr Zelensky announced on the 9th of this month that he would
At a closed meeting of the National Assembly Intelligence Committee on the 31st, the National Intelligence Service of South Korea announced that the number of North Korean casualties was about 4,000, including about 300 deaths.
The number was reported as 3,000.