The Financial Times writes about this, citing its sources.

The material says that six unnamed Western officials expressed concern about the joint statement by Russian and Turkish Presidents Vladimir Putin and Recep Tayyip Erdogan about their intention to expand bilateral cooperation in trade and energy.

An unnamed European Union official noted that the EU is "more and more closely" monitoring Russian-Turkish cooperation.

Another official said that Ankara's attitude towards Moscow is "extremely opportunistic."

“We are trying to get the Turks to pay attention to our concerns,” RIA Novosti quotes him as saying.

Earlier, Putin and Erdogan agreed to increase trade between the two countries and meet the expectations of both sides in the field of economy and energy.

Senior researcher at the Center for European Studies at IMEMO RAS Vladimir Olenchenko commented in an interview with RT on the results of the talks between Putin and Erdogan in Sochi.