Finland warned the public of drones possibly entering its airspace, for the first time near the capital city Helsinki, in the early hours of Friday. Flights were disrupted at the country’s biggest airport, Helsinki-Vantaa, and about 1.8 million residents of southern Finland were told to remain indoors after overnight Ukrainian strikes on Russia near Finland prompted concern that unmanned aircraft had strayed into the country. The emergency warning was issued at 3.49am local time and authorities...