You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Dialect

Context:
After World War II, due to Ukrainian collaborationism with the Axis powers in an attempt to gain independence, Moscow changed its policy towards repression of the Ukrainian language.

Question:
Why did Moscow begin to repress the Ukrainian language?

Ukrainian collaborationism with the Axis powers