Shelling is ongoing near the largest nuclear power plant in Europe.
Russian President Vladimir Putin's "special military operation" into neighboring Ukraine began on Feb. 24, with Russian forces invading from Belarus, to the north, and Russia, to the east. Ukrainian troops have offered "stiff resistance," according to U.S. officials.
The Russian military has since launched a full-scale ground offensive in eastern Ukraine's disputed Donbas region, capturing the strategic port city of Mariupol and securing a coastal corridor to the Moscow-annexed Crimean Peninsula.
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Two Zaporizhzhya nuclear power plant employees were killed on their day off when Russian forces shelled the city of Enerhodar, officials said.
-ABC News’ Yuriy Zaliznyak and Dada Jovanovic
The U.S. will announce its largest single aid package for Ukraine on Wednesday, according to two U.S. officials. The package is expected to be valued at roughly $3 billion -- though one official told ABC News some changes could be made overnight, and $3 billion is on the higher end of the estimates.
A senior U.S. official told ABC News the package will come from Ukraine Security Assistance Initiative funds. Unlike presidential drawdown packages, which pull from existing U.S. equipment stocks, the USAI money can be spent on contracts with the defense industry to produce new equipment for Ukraine.
The U.S. has committed about $10.6 billion in military aid to Ukraine since the beginning of the Biden administration.
-ABC News' Matt Seyler and Shannon Crawford
The United States is once again urging its citizens to leave Ukraine amid concerns Russia is ramping up attacks on civilians in the war-torn country.
In a security alert posted Tuesday on its website, the U.S. Embassy in Kyiv urged Americans "to depart Ukraine now using privately available ground transportation options if it is safe to do so."
"The Department of State has information that Russia is stepping up efforts to launch strikes against Ukraine's civilian infrastructure and government facilities in the coming days," the embassy said in the alert. "Russian strikes in Ukraine pose a continued threat to civilians and civilian infrastructure."
Sources within the State Department said the heightened risk of a Russian strike on highly populated centers is most directly tied to Ukraine's Independence Day on Wednesday.
"The risks are really high," Ukrainian President Volodymyr Zelenskyy told ABC News. "We are receiving information that there may be a provocation by the Russian Federation, by the occupiers. Therefore, we do not want large gatherings on such days. The days are beautiful, but ... our neighbors are not."
Russia’s FSB is accusing Ukrainian special services of assassinating Darya Dugina, the daughter of Putin ally Alexander Dugina, who was killed by an explosive this weekend.
The FSB said a Ukrainian national arrived in Russia on July 23 with her 12-year-old daughter and rented an apartment in the same Moscow building where Dugina lived, Russia's state-run RIA Novosti reported. The woman allegedly trailed Dugina for nearly a month and then immediately left for Estonia with her daughter just after this weekend’s bombing.
Russian President Vladimir Putin said in a statement that Darya Dugina was "a bright, talented person with a real Russian heart - kind, loving, sympathetic and open."
Mykhailo Podolyak, an adviser to Ukrainian President Volodymyr Zelenskyy, said Ukraine is working under the assumption that Russian secret services are behind the killing, saying "Ru-propaganda lives in a fictional world."
-ABC News' Anastasia Bagaeva and Oleksii Shemyskyo
