Russia has previously alleged Turkish involvement in illegal oil trade with Islamist militants. Now Russian military officials are claiming that President Recep Tayyip Erdogan is personally involved.
Russian officials responded by announcing plans to halt joint projects with the small Balkan nation. The last countries to join NATO were Balkan states Albania and Croatia, in 2009.
Tehran's Museum of Contemporary Art has a spectacular collection of 20th century Western art. But until now, most of it has been locked away in a vault since the 1979 Islamic Revolution.
The breakfast dish known as mohinga is sold all day long by curbside hawkers who carrying their wares on shoulder poles or bicycle carts, as well as in shops and restaurants in every price range.
The CEO of Facebook and his wife have announced the birth of their baby girl Max, and committed to giving 99 percent of their shares in the company for philanthropic purposes.
Mayor Rahm Emanuel said public trust in the city's police had been "shaken" and "eroded" by the shooting of a black teenager by a white police officer. Protesters had called for the chief's ouster.
The number of people being diagnosed with diabetes has been on the decline since 2009, after soaring for decades. Doctors say people may be changing their eating and exercise habits for the better.