because of possible invasion of Ukraine by Russia, Saint Petersburg, the hosts of the UEFA Champions League final this year, is more likely to lose their hosting rights. Meaning that UEFA would look for a more suitable city to host the Champions League final such as Barcelona, Hamburg, Rome etc.
Here's the article that explains about UEFA possibly moving the Champions League final away from Saint Petersburg:https://www.sportingnews.com/us/soccer/news/uefa-champions-league-final-moved-russia-invade-ukraine/o09gjqe7z5cettc3yk62e0up