Relatives ran down before they fully cleared security Tuesday night at North Carolina's Raleigh-Durham International Airport to greet them after their exodus from Ukraine to the United States.
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"On Wednesday, it was normal life for us," Marchenko said. "On Thursday, everything changed. It was so scary because I have two small children."
Marchenko was met by her two sisters and others with balloons and flowers.
"I'm lucky, but there are so many people in Ukraine even women with children who are not so lucky," she said.
MORE: Russia-Ukraine live updates
Eight months in and the war in Ukraine is intensifying. Russian missiles haven taken out parts of the power grid and leaving millions in the dark.
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Marchenko, her children and two other family members started their journey in Kyiv.
Her husband, who cannot leave the country, drove them to Lviv, a city about 300 miles west of the capital. An order from Ukraine's government prohibiting men aged 18- to 60-years-old from leaving the country -- so as to keep them available for military conscription -- means that many women and children must seek safety on their own.
From Lviv, they walked for hours before Polish friends picked them up near the border.
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They then flew from Warsaw to Munich, then Munich to Washington, D.C. before their arrival in Raleigh.
"The husbands are there. Our brothers are there, and our children are there fighting for our freedom," said Ulyana Marchenko, Halyna's sister. "Ukraine is the most peaceful nation in the world."
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Their mother is still in their home country. She tells her daughter, "When the sun goes down, I'm scared. Our capital is destroyed."
They were able to get out of harm's way because of the generosity of a local couple who has donated hundreds of thousands of United Airlines miles to help people like Marchenko.
A United Airlines team was also at the airport to greet everybody.
"It's amazing," Marchenko said. "I don't have the words to explain it to you. It's amazing our whole family is together in one place. Now I can sleep."