The Portuguese Navy is monitoring the movements of the Russian-flagged SPARTA IV, which has been sailing "from south to north" along the Portuguese coast since Sunday, Lusa news agency reported, quoting a navy source. ADVERTISEMENT ADVERTISEMENT On Wednesday night, the SPARTA IV was off Nazaré, in the Leiria district. The VesselFinder ship tracking app indicated that the Russian ship left the port of Baltiysk, in the Russian enclave of Kaliningrad, at the end of December. "The ship is sailing