America’s Road to the Ukraine War - The New York Times
https://www.nytimes.com/2022/04/24/us/politics/russia-ukraine-diplomacy.html
1991-12 Ukrainian independence referendum1994-12 Budapest Memorandum on Security Assurances2013 Obama administration and Ukraine2013-11 Euromaidan2014 Russo-Ukrainian War2014-02 Russia annexes Crimea2016 Ambassadorship of Marie Yovanovitch2017 Trump administration and Ukraine2020-07 Impeachment of Donald Trump2021 Biden administration and Ukraine2022 NATO, Russia and the Russian invasion of UkraineNATO and RussiaNATO and UkrainePaul Manafort and UkraineRussia and Crimea
Budapest Memorandum on Security Assurances - Wikipedia
https://en.wikipedia.org/wiki/Budapest_Memorandum_on_Security_Assurances
Looking Back: Ukraine’s Nuclear Predicament and the Nonproliferation Regime | Arms Control Association
https://www.armscontrol.org/act/2014-12/features/looking-back-ukraine%E2%80%99s-nuclear-predicament-nonproliferation-regime
The Budapest Memorandum and the Russia-Ukraine Crisis - War on the Rocks
https://warontherocks.com/2015/06/the-budapest-memorandum-and-the-russia-ukraine-crisis/
UKRAINE GIVES IN ON SURRENDERING ITS NUCLEAR ARMS - The New York Times
https://www.nytimes.com/1994/01/11/world/ukraine-gives-in-on-surrendering-its-nuclear-arms.html