I've put together a timeline of incursions into the airspace of European countries in recent months. Honestly, when it's all in one place, that looks very worrying. Please let me know if I've missed any incursions.
Poland
August 20: a Russian drone exploded over Lublin Voevodeship
September 10: massive incursion of Russian drones into Poland's airspace; 19 drones detected.
Norway:
April 25: Northeast of Vardø;
July 24: Eastern part of Finnmark region;
August 18: Northeast of Vardø;
September 22: drone(s) over Gardermoen.
Latvia:
September 18: a tail part of a Gerbera-like drone found on the beach;
September 25: Five Russian aircraft close to Latvia's airspace; Hungarian aircraft rose into the air to take over.
Estonia:
September 19: Russian MiG-31 aircraft spent 12 minutes in Estonia's airspace.
Romania:
September 13: Russian drone in the country's airspace, tracked down by two F-16 jets.
Germany
September 26: several drones spotted over/near Schleswig-Holstein.
Denmark:
September 22: Copenhagen's airport closed due to drones;
September 25: Aalborg and Billund airports closed, drones were spotted at Esbjerg, Sonderborg and Skrydstrup.
September 26: airspace over Aalborg airport closed again due to drones.
Sweden:
September 26: drones spotted by Karlskrona Naval Base.
Lithuania:
September 26: Vilnius airport closed down twice due to alleged drones flying in the area.
Finland:
September 27: a drone spotting over Rovaniemi power plant became public knowledge. Allegedly, the incident took place several days earlier.
As Prime Minister Frederiksen explained today, these are hybrid attacks, there will most likely be more of them and the security threat is very, very real.