Estonia is warning that Russia appears willing to defend with military force its shadow fleet of aging tankers dodging international sanctions to keep oil revenue flowing.

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.