Czech Republic expells 18 Russian diplomats (spies with diplomatic cover) and Russia will answer the same way, de-facto closing Czech Embassy in Moscow. The reason is the 2014 heavy blasts in ammunition storage facility of the private company IMEX. Ammunition was sold through Bulgarian trader and was to be exported to Ukraine, in conflict with Russia. Two Russian spies were accused for setting the blasts. Private gun trade from Czech Republic to lot of conflict areas takes all citizens to involvement in military conflict.
Pictures are from Amnesty International leaflet. https://amnesty.cz/zbrane/