A string of mysterious explosions and a poisoning have targeted Bulgaria’s arms industry, which has been a crucial supplier of weapons to Ukraine.

But amid mounting evidence of Russian involvement, critics accuse Bulgarian authorities of dragging their feet in their investigations of these unsolved blasts.

A new @svobodna-evropa documentary looks into evidence of Russian sabotage, claims that there have been cover-ups by Bulgarian authorities, and whether Bulgarian arms depots are still at risk as Russia’s full-scale invasion of Ukraine enters a second year.