UFO Map: Europe 1965-1969
Of some 2580 *U* listings for 1965 - 1969 worldwide, 601 or 23.3% were in Europe. 136 were in Eastern Europe, at long last.
France leads with 169 listings, then Spain / Portugal (110, Britain/Ireland (104),Romania (92), Soviet Union (41), Scandinavia (29), Italy (22) .. Note the blank areas from the Netherlands through Germany and Poland into Ukraine. This is simply lack of reports, rather than sightings.
From about 60 listings per year in 1965-1966, Western Europe jumped to 128 in 1967 and 126 in 1968. The majority of cases occurred in the last 6 months of both years. After another 94 events in 1969, the counts trail off again.
The sightings sightings in Romania derives mainly from the book UFOs from Behind the Iron Curtain by Ion Hobana and Julien Weverbergh.