Russian tankers carrying oil chemicals and oil products are increasingly concealing their movements, a phenomenon that some maritime experts warn could signal attempts to evade unprecedented sanctions prompted by the invasion of Ukraine.

In the week ending March 25, there were at least 33 occurrences of so-called “dark activity” — operating while onboard systems to transmit their locations are turned off — by Russian tankers, said Windward Ltd., an Israeli consultancy that specializes in maritime risk using artificial intelligence and satellite imagery. That’s more than double the weekly average of 14 in the past year.

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