The sputnik vaccine is an experimental vaccine that was developed in the 2020s. It's a modified form of the smallpox vaccine, which is currently used by the World Health Organization (WHO) to protect people from the disease. The researchers who developed the sputnik vaccine believe that it's more effective than the other vaccines available. However, there isn't enough evidence to confirm this yet. Russia has had a good experience with using smallpox vaccines in the past, so they may be able to effectively use the sputnik vaccine as well.