Estonia warned on Thursday that Russia appears willing to defend with military force its shadow fleet of aging tankers dodging international sanctions to keep oil revenue and equipment flowing, even through the territorial waters of European countries.

The Russian Sukhoi Su-35 entered Estonia's airspace for less than a minute on Tuesday evening above the Juminda Peninsula area in the Gulf of Finland, according to the Estonian De

Russia deployed a fighter jet in NATO airspace this week after Estonia tried to inspect a so-called shadow fleet tanker passing the EU-member’s economic area, Estonia’s Foreign Minister Margus Tsahkna said.