This was stated in an interview with RIA Novosti by Russian Ambassador to Austria Dmitry Lyubinsky.
“Our proportionate response to the unfriendly actions of the Austrian authorities will inevitably follow, they are already being worked out in Moscow,” he said.
On February 2, Austria declared four Russian diplomats persona non grata because they had committed "actions incompatible with their diplomatic status."
In addition, the authorities asked two diplomats from among the representatives of the Permanent Mission of Russia to the UN to leave the territory of the republic.
Austrian Defense Minister Claudia Tanner told Euractiv on February 3 that Vienna is trying to keep diplomatic channels open with Russia amid the Ukraine conflict and Western sanctions.