1991 Ukrainian independence referendum - Wikipedia
https://en.wikipedia.org/wiki/1991_Ukrainian_independence_referendumAmerica’s Road to the Ukraine War - The New York Times
https://www.nytimes.com/2022/04/24/us/politics/russia-ukraine-diplomacy.html1991-12 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