{{redirect|Invasion of Ukraine|the ongoing event|2022 Russian invasion of Ukraine}}<!-- Yes, it's linked below, but better to have it at the top for navigational aid. -->

[[Ukraine]] has been [[Invasion|invaded]] or [[Military occupation|occupied]] a number of times throughout [[History of Ukraine|its history]].

|Initial fighting in the war lasted from January to June of 1918, ending with the Central Powers' intervention.<ref name="subtelny" />{{rp|pages=350, 403}}

|The Soviet Union invaded Poland in September of 1939, extending into [[Western Ukraine]].<ref name=subtelny/>{{rp|page=454}}

|Nazi Germany invaded the Soviet Union, including Ukraine,<ref name=subtelny/>{{rp|pages=453, 460}} in June of 1941 with assistance from allied Romania.<ref name="solonari">{{Cite book |last=Solonari |first=Vladimir |url=https://www.worldcat.org/oclc/1083701372 |title=A Satellite Empire: Romanian Rule in Southwestern Ukraine, 1941-1944. |date=2019 |isbn=978-1-5017-4319-1 |location=Ithaca, New York |oclc=1083701372}}</ref> By November they controlled almost all of what had been Soviet Ukraine, including the portion annexed in 1939.<ref name="Magosci" />{{rp|page=624}}

|After a commencement of hostilities in April 2014, Russian forces invaded the [[Donbas]] region of Ukraine in August of that year.<ref>{{Cite book |last=Snyder |first=Timothy |title=The road to unfreedom: Russia, Europe, America |isbn=978-0-525-57446-0 |edition=First |location=New York, NY |page=191 |oclc=1029484935}}</ref><ref name="rand-lessons"/> A report released by the [[Royal United Services Institute]] in March 2015 said that "the presence of large numbers of Russian troops on Ukrainian sovereign territory" became a "permanent feature" of the war following the invasion,<ref name="RUSIma2015">{{Cite web |last=Igor Sutyagin |date=March 2015 |title=Briefing Paper: Russian Forces in Ukraine |url=https://www.rusi.org/downloads/assets/201503_BP_Russian_Forces_in_Ukraine_FINAL.pdf |archive-url=https://www.webcitation.org/6Y4ei6Ide?url=https://www.rusi.org/downloads/assets/201503_BP_Russian_Forces_in_Ukraine_FINAL.pdf |archive-date=26 April 2015 |access-date=11 March 2015 |publisher=Royal United Services Institute}}</ref> with [[regular army|regular]] Russian and Ukrainian forces coming into direct conflict at the [[Battle of Ilovaisk]]<ref name="judah">{{cite web|author=Tim Judah|url=http://www.nybooks.com/daily/2014/09/05/ukraine-catastrophic-defeat/|title=Ukraine: A Catastrophic Defeat|work=[[The New York Review of Books]]|date=5 September 2014|access-date=31 March 2022}}</ref><ref>{{Cite news|url=https://www.kyivpost.com/thousands-russian-soldiers-fought-ilovaisk-around-hundred-killed|title=Thousands of Russian soldiers fought at Ilovaisk, around a hundred were killed|work=[[KyivPost]]|access-date=31 March 2022|language=en-US}}</ref> and likely the [[Battle of Debaltseve]].<ref name="katchanovsky">{{Cite journal|last=Ivan|first=Katchanovski|title=The Separatist War in Donbas: A Violent Break-up of Ukraine?|url=https://www.academia.edu/23620643|journal=European Politics and Society|year=2016|language=en|volume=17|issue=4|page=473|doi=10.1080/23745118.2016.1154131|s2cid=155890093 }}</ref> Low-intensity fighting continued through 2022, despite the declaration of numerous ceasefires.