Ukraine has asked Turkey to close the Bosphorus and Dardanelles straits to Russian warships, Kyiv’s ambassador to Ankara says. “We are calling for the air space, Bosphorus and Dardanelles straits to be closed. We have conveyed our relevant demand to the Turkish side. At the same time, we want sanctions imposed on the Russian side,” Ambassador Vasyl Bodnar told a news conference in the Turkish capital. The request puts NATO member Turkey, which shares a maritime border with Ukraine and Russia in the Black Sea and has good relations with both countries, in a difficult position. Under a 1936 pact, Ankara has control over the straits and can limit warship passages during wartime or if threatened.