More than 1,600 planes are hit by mysterious GPS jamming across Europe - with Russia feared to be responsible | Daily Mail Online
Planes flying around the Baltic Sea have been suffering technical problems caused by jamming since Sunday, with 1614 planes, mostly civilian, reporting problems since then
https://www.dailymail.co.uk/news/article-13241019/More-1-600-planes-hit-mysterious-GPS-jamming-Europe-Russia-feared-responsible.html
This was a test. Only a test.
Check check 1, 2, III.