Turkish President Recep Tayyip Erdogan will visit Russia on August 9 for his first face-to-face meeting with Vladimir Putin since Moscow and Ankara mended ties damaged by the downing of a Russian jet last year, Turkish officials said Tuesday.

Turkish President Recep Tayyip Erdogan on Monday accused the EU of not paying its way under a deal to send Syrian refugees back across the Aegean.

Human rights group Amnesty International said Sunday it had "credible evidence" of the abuse and torture of people detained in sweeping arrests since Turkey's July 15 coup.

A six percent loss in value of its currency, a plunge on the stock market and a downgrade by a key ratings agency.

Turkey has detained a senior aide to the U.S.-based cleric Fethullah Gulen whom it blames for the coup attempt aimed at ousting President Recep Tayyip Erdogan, an official said on Saturday.

Germany on Wednesday condemned Turkey's escalating crackdown following a failed coup, saying the hardline response "flouts the rule of law".

"Nearly every day we are seeing new measures that flout the rule of law and that disregard the principle of proportionality," government spokesman Steffen Seibert told reporters.

Ratings agency S&P on Wednesday downgraded Turkey's sovereign credit rating after Friday's failed coup bid.

The Turkish armed forces have carried out their first air strikes against Kurdish militants in northern Iraq since last week's coup attempt, killing 20 fighters, state media reported Wednesday.

F-16 fighter jets late Tuesday hit targets of the outlawed Kurdistan Workers Party (PKK) in the Hakurk region of northern Iraq, said the state-run Anadolu news agency, quoting security sources.

The failed coup attempt in Turkey and President Recep Tayyip Erdogan's firm crackdown on the alleged plotters have aggravated ties between Washington and Ankara, already poisoned by the war in Syria and human rights issues.

Although they are NATO allies and officially partners in the fight against the Islamic State group, the United States and Turkey have seen their relations take an icy turn in recent months.

Turkish Prime Minister Binali Yildirim on Tuesday warned against revenge in the aftermath of a failed coup targeting his government.