A Russian vessel, the Yantar, is very close to UK territorial waters in the North Sea, and it it believed recently to have briefly entered them. The Yantar is a survey vessel believed to be mapping vital sea bed infrastructure. Navy planes have buzzed the vessel and the Russians have tried to blind pilots with Lasers. The UK has warned the Russians that if the Yantar proceeds any further south the Royal Navy will engage the Yantar.
The Russians are not happy and being bellicose.