In 2015 a virus spread from the south of Ukraine, named Chenarus. A facility had experimented with a secret project known only to the top officials/politicians and the scientists that worked on the project. But something went wrong during a test and the virus got out to the population. The virus turned the people into the living dead. At first the government tried to handle it on their own however they realized they needed help.
The government called for help from the US and UN. However even with the extra help they couldn’t keep up with the virus. With the government and military dissolved the people that still live are left to survive on their own.