https://www.al-monitor.com/originals/2023/11/how-russias-redut-pmc-forced-rival-wagner-withdraw-syria
https://www.project-syndicate.org/commentary/moodys-downgrade-china-sovereign-debt-rating-by-yu-yongding-2017-06
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