Russian Security Service Briefly Detains Ukrainian Diplomat

A service member of the Ukrainian armed forces points a weapon at fighting positions on the line of separation near the rebel-controlled city of Donetsk, Ukraine, on Apr. 16, 2021. Serhiy Takhmazov/ Reuters

MOSCOW—Russia’s FSB security service briefly detained a Ukrainian diplomat in St Petersburg, Ukraine’s foreign ministry said on Saturday, in the latest flare-up of tensions between the neighboring countries.

Interfax news agency earlier reported the FSB as saying Oleksandr Sosoniuk was taken into custody when he tried to obtain classified information from Russian law enforcement databases during a meeting with a Russian citizen.