Austria expels three Russian diplomats over antenna spying claims

Vienna has long served as a hub for international diplomacy and, by extension, intelligence activity — hosting the United Nations offices, the OSCE, and numerous bilateral missions that make it a consistent target of foreign intelligence services. Austria's neutral status, established under the 1955 State Treaty, has historically made it attractive to both Western and Russian intelligence operations. Antenna-based interception is a longstanding signals intelligence technique, and embassies in capital cities have periodically come under scrutiny for using rooftop or in-building equipment to collect communications. Diplomatic expulsions over espionage claims have increased across Europe in the years following Russia's 2022 invasion of Ukraine, as Western governments have moved to reduce Russian diplomatic presences.