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Moscow and Czechia are expelling each others' "diplomats" in a conflict over Russia's campaign of sabotage in Europe.
Czechia also cancelled a nuclear contract with Russia for good measure.
"That project was critical not just for the income to Russia but for the influence over local affairs," a source told Insider.
Russia announced on Monday the expulsion of at least 20 Czech diplomats in a furious response to the gutting of Moscow's most critical intelligence station in central Europe over the weekend, when Czech authorities accused Russian intelligence of being behind two blasts at an ammunition storage facility in 2014.