Since December last year, the key rate in the country has been at the level of 14%.
According to CNN Türk, the regulator's decision came as a surprise to most analysts.
On August 5, Presidents of Russia and Turkey Vladimir Putin and Recep Tayyip Erdogan agreed to increase trade between the two countries and meet the expectations of both sides in the fields of economy and energy.
The Financial Times, citing two EU officials, wrote that this caused concern in the EU.