Catherine Belton: Putins Netz. Wie sich der KGB Russland zurückholte und dann den Westen ins Auge fasste. HarperCollins, Hamburg 2022, ISBN 978-3-7499-0328-3, S.49 (eingeschränkte Vorschau in der Google-Buchsuche – englisch: Putin’s People: How the KGB Took Back Russia and Then Took On the West. London 2020.).
Andrea Shalal, Timothy Gardner, Steve Holland: U.S. waives sanctions on Nord Stream 2 as Biden seeks to mend Europe ties. In: Reuters. 19. Mai 2021, abgerufen am 16. November 2021 (englisch): „The Biden administration waived sanctions on the company behind Russia's Nord Stream 2 gas pipeline to Germany and its chief executive […] State Department report sent to Congress concluded that Nord Stream 2 AG and its CEO, Matthias Warnig, an ally of Russian President Vladimir Putin, engaged in sanctionable activity. But Blinken immediately waived those sanctions.“