A U.S. citizen has been arrested on drug charges in Russia, officials said Tuesday, a move that comes amid soaring Russia-U.S. tensions over Ukraine.

The arrest of Robert Woodland Romanov was reported by the press service of the Moscow courts. It said the Ostankino District Court ruled on Saturday to keep him in custody for two months on charges of preparing to get involved in illegal drug trafficking pending an official investigation. It didn’t offer any details of the accusations.

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Analysts have pointed out that Moscow could be using jailed Americans as bargaining chips amid U.S.-Russian tensions that soared when Russia sent troops into Ukraine. At least two U.S. citizens arrested in Russia in recent years — including WNBA star Brittney Griner — have been exchanged for Russians jailed in the U.S.