A Swedish citizen has been arrested by Russia’s Federal Security Service (FSB). According to state-controlled news agency Tass, the individual is accused of fighting for Ukraine. Russian authorities allege the Swedish national was planning attacks against Russian military installations. The arrest occurred near the border, though the specific location wasn’t detailed in the report. This incident marks another instance of heightened tensions between Russia and countries supporting Ukraine. The FSB has not released further details regarding the investigation or potential charges. This development likely complicates relations between Sweden and Russia, especially given Sweden's increased support for Ukraine.