Figure 1
The European High North (map prepared by the authors).
Figure 2
Annual number of Russian NOTAM events in the High North, 2015–2023.
Source: Authors’ NOTAM dataset.
Figure 3
Location of Russian NOTAM areas in the High North, 2015–2023.
Source: Authors’ NOTAM dataset.
Figure 4
Russian NOTAM areas in the High North before (red) and after (pink) the start of Russia’s full-scale invasion of Ukraine.
Source: Authors’ NOTAM dataset.
Figure 5
Average latitude of Russian NOTAM areas in the High North, 2015–2023 (events number 1–37 are those that took place before February 24, 2022; events number 38–67 are those that took place after this date). The red line shows the NOTAM areas’ average latitude.
Source: Authors’ NOTAM dataset.
Figure 6
Size of Russian NOTAM areas in the High North, 2015–2023.
Source: Authors’ NOTAM dataset.
Figure 7
Chronological order (x-axis), latitude (y-axis), and size of Russian NOTAM areas in the High North, 2015–2023. The size of the circles indicates the size of the NOTAM areas.
Source: Authors’ NOTAM dataset.
Figure 8
Duration of Russian NOTAM events in the High North, 2015–2023 (measured in days). The red line shows the change in average duration.
Source: Authors’ NOTAM dataset.