According to a decree shared on the Russian government's website, Russian President Vladimir Putin extended a fast-track citizenship process to all Ukrainians.
Ukrainians can apply for Russian citizenship without having to take a language test or live in Russia for five years.
Ukrainians don't have to show that they have enough money to support themselves in the country in order to get a Russian passport.
The streamlined procedure was only available to Ukrainians from the pro-Russia regions of Luhansk and Donetsk, which have been seized by Russian forces.
Russia has been known to grant easier citizenship access to the people of former soviet nations that it is in conflict with to maintain its influence in those areas.
Georgia has accused Moscow of pushing Russian passports onto their citizens.
Hundreds of thousands of Ukrainians were given Russian passports prior to Russia's invasion of Ukraine.
Russia has been struggling with a rapidly declining population and passportization can help. 2.5 million people were allowed to become citizens of Russia in a single night.
More than 1.5 million Ukrainians have fled to Russia since the beginning of the invasion, according to the UN.
According to the German Institute for International and Security Affairs, Ukrainians are an ideal group of migrants to Russia. The organization said that Eastern Slavs bring skills to the Russian labor market.
Ukrainian Foreign Minister Dmytro Kuleba said that Putin's Monday decree was meaningless and that it only served to show Putin's predatory appetites.