There is statistical evidence.
Greek shipowners have indeed reduced the volume of Russian oil transportation, according to the analysis of Lloyd's List. In November, their tankers accounted for just 32% of the vessels that helped Russia export oil and petroleum products from ports on the Black and Baltic Seas. This figure reached 54% a year ago.
At the same time, the share of the shadow fleet began to increase. In November, it rose to 45%, the highest level since February 2023, when the European embargo on Russian oil products came into force (the oil embargo has been in effect for a slightly longer period – from December 2022).
The share of the shadow fleet began to grow rapidly in July when oil prices began to rise, and the cost of the Russian Urals oil broke the price point for the first time.
On November 23, it became known that large Greece's Minerva Marine carriers, Thenamaris Inc. and TMS Tankers Ltd. refused to work with Russia, considering the risk of the U.S. sanctions. Later, Ukraine excluded them from the “shameful list” of international sponsors of the war.