The Russian invasion of Ukraine initiated this past February was the culmination of significant regional tension that had been brewing for several years. Ukraine regained independence when the Soviet Union fell in 1991. A decade later, the North Atlantic Treaty Organization (NATO) began expanding further into Eastern Europe; in 2004, former Soviet states Latvia, Lithuania and Estonia became members of the organization. NATO also adopted an “Open Door Policy,” meaning that any European State that wishes to embody the principles of NATO and its treaty can apply to join the organization. These developments implied that Ukraine, as a post-Soviet European state, could also one day join NATO—such a possibility was first put on paper at the 2008 Bucharest Summit. At this summit, the allies reaffirmed Ukraine’s right to determine its own security dispositions, a right that Russia had also accepted through treaties such as the NATO-Russia Founding Act in 1997. [1] The recent Russian invasion of Ukraine thus raises the question of whether the United States is legally allowed to interfere in the event that Russia takes over Ukraine; this question arises due to the conflict behind US military intervention. [2] Due to the violation of the law of aggression during armed conflict between Russia and Ukraine and the principle of collective self-defense, the United States is legally able to intervene in the conflict of the Russian occupation of Ukraine.

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