On February 24, 2022, Russian forces unleashed a wave of attacks on neighboring Ukraine. Given that Russia had been gathering troops on Ukraine's border since October 2021, the full-scale invasion from the north, east, and south was not totally unexpected. However, American and European Union (EU) officials had hoped that the threat of economic sanctions would deter Russian President Vladimir Putin from taking this drastic action. To better understand how we got here, it is essential to know a little about the long, complicated relationship between the two countries.