Do all revolutions end in failure?

Here you need to understand the fine line between revolution, coup and just protests. Not all revolutions end in failure. Yes, in the Middle Ages in Russia there were many protest movements that were involved. It was the same in many other countries. But it is worth remembering a series of bourgeois revolutions in different countries of the world. They were crowned with success. In addition, you can recall a number of other revolutions, for example, in Russia in 1917. At the same time, it can be argued that many revolutions did not lead to a change of power, but there were some concessions in the direction of the protesters.