Based on the events described in the letter by the Polish ambassador to North Korea, we can infer that this letter is about the Korean War.
This was a conflict between the Communist nation of North Korea and the capitalist nation of South Korea. Communist nations such as the Soviet Union and China supported the North.
Other communist nations at the time including Czechoslovakia, and Hungary, sent help which was why the Polish ambassador was also asking for Poland to send help to North Korea as well.
Find out more on the Korean War at https://brainly.com/question/1445566.