Austrian officials reportedly gave the unnamed Russian diplomat until Tuesday, September 1, to leave Austrian soil, in a move that surprised observers, given the close relations between Austria and Russia in recent years.

The Russian diplomat is accused by the Austrian authorities of engaging in “behavior that violated the Vienna Convention on Diplomatic Relations”. The Austrian Ministry of Foreign Affairs did not elaborate on the accusations against the diplomat, and refused to name him. However, the Vienna-based Kronen Zeitung newspaper, said on Monday that the Russian diplomat had carried out “industrial espionage” for several years. According to the paper, the Russian had recruited an Austrian citizen who worked for a technology firm to spy for Moscow. Austrian authorities arrested the man, who promptly identified the Russian diplomat as handler. The paper also said that, according to some sources, the man turned himself in to the authorities.

Later on Monday, the Russian Foreign Ministry summoned Johannes Aigner, Austria’s ambassador to Russia, and “strongly protested the unjustified course of action to cancel the accreditation of a Russian diplomat and order him to leave Austrian soil”. Moscow said in a statement its decision to expel an Austrian diplomat was “guided by the principle of reciprocity”. It is not known at this time how this incident will affect bilateral relations between Russia and Austria, which have been among Moscow’s warmest with a Western country in recent years.