http://www.kas.de/wf/doc/kas_450-2190-2-30.pdf?170424105349
https://www.brookings.edu/articles/putins-pressure-points-are-showing-time-to-strengthen-russian-sanctions/
https://www.brookings.edu/articles/how-the-niger-coup-unfolded/
https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/78/78.pdf