Turkish customs authorities have detained a Russian cargo ship carrying grain which Ukraine says is stolen, Ukraine’s ambassador to Turkey said on Sunday. Ukraine had previously asked Turkey to detain the Russian-flagged Zhibek Zholy cargo ship, according to an official and documents viewed by Reuters. Reuters reporters saw the Zhibek Zholy ship anchored about 1 km from shore and outside of the Karasu port on Sunday, with no obvious signs of movement aboard or by other vessels nearby. “We have full co-operation. The ship is currently standing at the entrance to the port, it has been detained b…