
https://www.brookings.edu/wp-content/uploads/2020/04/fp_20200402_coronavirus_policing.pdf

https://www.zeit.de/politik/ausland/2023-03/nordstream-2-ukraine-anschlag

https://www.ifw-kiel.de/fileadmin/Dateiverwaltung/IfW-Publications/-ifw/Kiel_Working_Paper/2022/KWP_2218_Which_countries_help_Ukraine_and_how_/KWP_2218_Trebesch_et_al_Ukraine_Support_Tracker.pdf