A letter from the North Korean soldier deployed in Russia to the medical staff who treated him./Courtesy of the Embassy of North Korea in Russia.

A thank-you letter left by North Korean troops deployed in Russia to Russian medical personnel who treated their injuries has been made public.

The Russian Embassy in North Korea released four letters on its Facebook on the 30th (local time), asserting that the messages were left by North Korean soldiers at a Russian hospital.

The letters consist of a total of four pages, including one written in Korean and three in Russian, featuring hand-drawn North Korean and Russian flags and depictions of medical personnel.

The North Korean army wrote, under the phrases 'North-Russia friendship and solidarity,' 'sincerity,' and 'bond of blood': "I greet all the doctors, nurses, and caregivers in the department who are dedicating themselves wholeheartedly with the love of a dear mother. Thank you."

They also wrote clearly in the letter, "We will forever engrave the sincerity you offer in the history of North-Russia friendship."

He wrote '92nd Brigade, 4th Battalion, Li Jung○' near the bottom of the letter, indicating his affiliation and name.

Russia has been publicly promoting the activities of the deployed North Korean troops, claiming they have acted heroically after officially acknowledging North Korea's deployment last month. This letter also appears to have been posted to showcase the blood alliance between the two countries.

Vladimir Solovyov, a presenter for Russian state television, posted footage of North Korean troops' combat training shared by the Ministry of National Defense on his Telegram on the 28th of last month (local time).