Russia and Ukraine have exchanged hundreds of prisoners of war in a deal brokered by the United Arab Emirates (UAE).
The Russian defence ministry said it had swapped 150 Ukrainian soldiers held captive for an equal number of Russian troops.
Ukrainian President Volodymyr Zelenksy said 189 Ukrainians had returned home.
He added that those released included "defenders of Azovstal and Mariupol", the Chernobyl nuclear power plant and Snake Island.
Outside a hospital in northern Ukraine, anxious relatives were wrapped up against the bitter winter cold, waiting for their loved ones.
One woman, Alina, was waiting for her husband, Oleksandr. He was captured defending the city of Mariupol in 2022.
"I have so many emotions," she said, tears streaming down her face, "It's been so difficult. I just want to see him."
The Russian defence ministry meanwhile said newly-released Russian troops were in Belarus, an ally of Russia, and were being given medical assistance and the chance to contact their families.
In a video posted by Russian human rights commissioner Tatyana Moskalkova, soldiers were seen gathered in front of coaches in military and winter clothing.
"Very soon our guys will hug their families and friends and celebrate the New Year on their native land," she said in an accompanying message.
Zelensky said two civilians captured in Mariupol were also among those released.
"We are working to free everyone from Russian captivity. This is our goal. We do not forget anyone," Zelensky said. He posted photos showing some of the swapped men sitting on a coach holding up yellow-and-blue Ukrainian flags.
In May 2022, Russia declared victory after a months-long battle to conquer the south-eastern Ukrainian port city of Mariupol, with the last fighters defending the Azovstal steel plant having surrendered.
Russian troops seized Chernobyl in the country's north-west at the beginning of their invasion of Ukraine in February 2022, but later handed back control of the plant to its employees.
Snake Island in the Black Sea was also seized in 2022 and the Ukrainian soldiers were taken prisoner, but later exchanged for Russian captives.