Is laughter the deadliest weapon? Alexei Navalny, the most famous critic of Vladimir Putin, is dead. But some supporters think he will live on through laughter.
The man who refused to take Putin seriously
Unbowed: Alexei Navalny was not afraid to stand up to authorities in Russia. Glossary
Corruption - When someone abuses their power for personal gain. It often involves bribery.
Russia - The largest country in the world by area. It has a population of 144 million people.
Vladimir Putin - Russia’s ruler since 2000. He is a strong opponent of the West.
Arrested - Stopped by the police and taken to a police station.
Sentenced - Declare the punishment for a person who has done something wrong.
Humour - The ability to find things funny, or the things you find funny.
Ridiculous - Silly or absurd.