https://www.brookings.edu/blog/order-from-chaos/2020/03/23/as-us-russian-arms-control-faces-expiration-sides-face-tough-choices/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=85144056
https://www.nzz.ch/international/radikales-regime-wie-sich-der-kreml-unter-wladimir-putin-radikalisierte-ld.1755674?reduced=true
https://www.clingendael.org/sites/default/files/2019-08/Report_US-China_stand-off.pdf