By David Ljunggren (Reuters) – Ukraine’s defence ministry on Saturday urged citizens in a key area seized by Russia to reveal where Moscow’s troops were living and who among the local population was collaborating with the occupying authorities. The statement by the ministry’s defence intelligence directorate was aimed at people in and around the southern city of Enerhodar, which is home to a major nuclear power station. “Please let us know as a matter of urgency the exact location of the occupying troops’ bases and their residential addresses … and the places of residence of the commanding s…