Turkey’s military deactivated a mine on Saturday that had drifted in from the Black Sea, setting off a loud explosion north of Istanbul, days after Russia warned several of them had washed away from Ukrainian ports. Defence Minister Hulusi Akar described the object, first discovered by fishermen in the upper Bosphorus strait, as an old type of mine and said he was in touch with both Russian and Ukrainian authorities about it. A Reuters witness heard a loud bang off the coastal village of Rumelifeneri, where naval vessels and military planes and helicopters were active. A minehunter ship was al…