The Americans, Andy Tai Ngoc Huynh and Alexander Drueke, are both from Alabama.
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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A look at the two leaders at the center of the war in Ukraine and how they both rose to power, the difference in their leadership and what led to this moment in history.
Russia's invasion of Ukraine has left 5.2 million kids in need of humanitarian help, according to UNICEF.
At least 262 children have been killed and another 415 have been hurt since Feb. 24, UNICEF said.
Nearly two-thirds have been displaced, UNICEF said.
Russian air strikes hit a tank with nitric acid at a chemical plant in Severodonetsk, a city in eastern Ukraine, according to Luhansk's regional governor, Serhiy Haidai.
Haidai is urging residents to stay inside and to wear protective face masks.
Haidai also said Russian forces have made significant gains and are in control of "most" of Severodonetsk.
He said about 60% of homes are completely destroyed and the city's critical infrastructure is nearly completely destroyed. Ongoing shelling is preventing civilians from evacuating.
The European Union Council plans to finalize a ban on nearly 90% of Russian oil imports by the end of 2022, European Commission President Ursula von Der Leyen said Tuesday at a joint press conference with EU Council President Charles Michel, following Monday's special meeting of the European Council.
Von der Leyen said they will soon return to the issue of the remaining 10% of pipeline oil.
-ABC News' Christine Theodorou
Russia's top diplomat vowed Tuesday to "ensure unhindered passage" of grain shipments from Ukrainian ports to the Mediterranean Sea, if Ukraine removes the mines from its coastal waters.
"Ukrainian representatives should de-mine the coastal waters within Ukraine's territorial sea, which have been mined," Russian Foreign Minister Sergei Lavrov said at a press conference. "If the de-mining problem is resolved -- and we've been bringing the attention of our worried Western counterparts to this problem for many weeks -- then the Russian Navy will ensure unhindered passage of those vessels in high seas to the Mediterranean and further on to their destination points."
Since Russian forces invaded neighboring Ukraine on Feb. 24, the cost of grain, fuel and fertilizer has skyrocketed worldwide, worsening hunger crises. Russia and Ukraine produce a third of the world's supply of wheat and barley, but Kyiv has been unable to ship exports due to Moscow's offensive.
Lavrov, however, blamed the situation on Kyiv and the West.
"For longer than a month now, the Russian side has been taking measures to guarantee the unhindered export of Ukrainian grain by vessels that are currently stranded in Ukrainian ports," Lavrov added. "Therefore, the initiatives concerning food security that have been voiced should be implemented bearing in mind that the Russian side has long guaranteed everything that depends on us. As for the Western countries that have artificially caused numerous problems by closing their ports to Russian vessels and cutting logistical and financial chains, they should certainly think hard whether it's more important for them to advertise themselves taking advantage of food security problems, or take practical steps to resolve this problem. It's for them to choose."
