Translation: The food was great! Unfortunately, Putin spoiled our appetites by invading Ukraine. Stand up to your dictator, stop killing innocent people! Your government is lying to you. Get up!
If you don't know what to say here is an example text:
Еда была отличной! К сожалению, Путин испортил наши аппетиты, вторгшись в Украину. Противостаньте своему диктатору, прекратите убивать невинных людей! Ваше правительство лжет вам. Вставай!
Go to Google Maps. Go to Russia. Find a restaurant or business and write a review. When you write the review explain what is happening in Ukraine.
Idea via @Konrad03249040