Russia's FSB domestic security agency announced on Monday that it had killed a group of saboteurs from Ukraine attempting to cross into a Russian border region."As a result of a clash on December 25, 2022, four saboteurs, who attempted to enter the territory of the Bryansk region from Ukraine, were killed," the FSB said in a statement carried by Russian news agencies.It added that they were carrying German submachine guns, navigation equipment and "four improvised explosive devices."A video shared by news agencies and attributed to the FSB showed several bloodied bodies sprawled on the ground, wearing winter camouflage and carrying guns.Russia has accused pro-Kyiv forces of a number of sabotage attacks, including a blast that damaged a bridge linking annexed Crimea to Russia.Last week, Russian lawmakers backed long prison terms for "saboteurs", pointing to emerging terror threats including from foreigners amid the Ukraine conflict.