Russian authorities on Tuesday announced an investigation into attacks in the Belgorod region, bordering Ukraine, as Moscow’s unprovoked invasion of Ukraine continues into its second year.

Defense Ministry Spokesman Lieutenant-General Igor Konashenkov described the incident in a statement: “[O]n May 22, after intensive artillery bombardments of the Kozinka international checkpoint, and also some other civilian facilities in the Graivoronsky district of the Belgorod Region, a Ukrainian nationalist formation intruded into the territory of the Russian Federation.”

A separatist group, known as the Freedom of Russia Legion, has claimed responsibility for Monday’s incursion onto Russian soil. The Ukrainian government denies any involvement. Leaked US intelligence documents revealed that Zelensky has, in the past, proposed occupying Russian villages as a means of gaining leverage over the invading Russian forces, The Washington Post reported. 

Russia’s Investigative Committee claimed the Belgorod attacks caused injuries to residents and property damage, stating, “Residential and administrative buildings and civilian infrastructure facilities came under mortar and artillery fire…Several civilians were injured as a result of these criminal acts.” The investigators announced they are looking into myriad possible violations of the Russian Criminal Code, including “terrorist acts, encroachment on the life of law enforcement officers, attempted murder, intentional destruction or damage to property, [and] illegal arms trafficking and explosives.”