At a technology fair in Moscow last month, European executives faced the new reality of doing business in Russia since the West imposed sanctions: the number of companies at the international showcase had shrunk by half from a year ago.

"The impact on business couldn't be clearer. Fewer stands, fewer companies," said Mark Bultinck, a sales executive for Belgian digital screen maker Barco, which had a booth at the annual expo for the audiovisual industry.

The impact of the sanctions was already clear to Barco.

The company lost Russia's biggest shipbuilder as a client when the United States and the European Union blacklisted United Shipbuilding Corporation in July, meaning Barco could no longer sell screens to the company for its vessel training simulators.

Barco's experience shows how sanctions are having a broad impact not just on Russian companies but on European ones too and at a time when Europe's weak economy can ill afford it.

companies are at risk of losing contracts to competitors from China and elsewhere, according to Frank Schauff, chief executive office at the Association of European Businesses in Russia.