Swindon drone factory was target of Russia plot involving British man, court hears; Poland says Ukraine border crossing came under threat. What we know on day 1,661

The UK, Norway and the US reportedly tracked Russian submarines testing a secret weapon near Svalbard that could be used to target critical undersea cables.

The clandestine Russian operation, described to Reuters by two Western officials, was carried out by Moscow's GUGI undersea warfare directorate.