ZURICH/MOSCOW - Assets totaling between $1.5 billion and $2 billion have been frozen as a result of sanctions imposed on Russian oligarch Viktor Vekselberg and his Renova Group conglomerate, two sources close to the matter told Reuters on Saturday.

FILE PHOTO: Chairman of the Board of Directors of Renova Group, Viktor Vekselberg attends a session during the Week of Russian Business, held by the Russian Union of Industrialists and Entrepreneurs (RSPP), in Moscow, Russia February 7, 2018. REUTERS/Sergei Karpukhin/File Photo

The United States imposed sanctions against several Russian entities and individuals, including Swiss-based Russian oligarch Viktor Vekselberg and his Renova Group, on April 6 to punish Moscow for suspected meddling in the 2016 U.S. election and other alleged “malign activity.”

As a result of the sanctions, all U.S. dollar bank accounts of companies controlled by Renova have been blocked, the people told Reuters, confirming an earlier report in Swiss paper Finanz und Wirtschaft on Saturday.

FILE PHOTO: The logo of Russian company Renova Group is seen at its headquarters in Moscow, Russia, September 5, 2016. REUTERS/Sergei Karpukhin/File Photo

Renova declined to comment on the situation.

Ties to Renova have caused difficulties for a number of European firms since the sanctions were announced, with pumpmaker Sulzer (SUN.S) taking a one-off hit from business disruption and agreeing to buy 5 million shares from Renova to free itself from sanctions.

Meanwhile, Italy’s Octo Telematics put its IPO on hold and Steelmaker Schmolz & Bickenbach (STLN.S) has faced snags in clearing a bond placement needed to finance a deal.

Nonetheless, Renova, which is headquartered in Moscow and has a subsidiary in Zurich, intends to maintain its Swiss holdings, which also include a stake in Oerlikon (OERL.S).

Renova and Vekselberg are

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