President of the European Commission Ursula von der Leyen announced on Thursday that she would help organise a conference on securing the return of Ukrainian children taken to Russia during the conflict.
"It is a horrible reminder of the darkest times of our history, what's happening there to deport children," Ms von der Leyen said after a summit of EU leaders. "This is a war crime."
The International Criminal Court issued an arrest warrant last week accusing Russia's President Vladimir Putin of war crimes for the deportation of Ukrainian children.
More than 16,000 Ukrainian children have been taken to Russia since Moscow's February 24, 2022, invasion, according to Kyiv, with many said to be placed in institutions and foster homes.
Ms von der Leyen said she would work with Poland's Prime Minister Mateusz Morawiecki to gather international support for their return.
"We know today of 16,200 children that have been deported," she said. "Only 300 have returned so far, and these criminal actions completely justify the arrest warrants issued by the ICC.
"We are at the very beginning of very hard work. We aim to pull together international pressure to take all possible measures to establish the whereabouts of these children.
One year of the Russia-Ukraine war - in pictures
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February 24 will be a year since Russia started the Ukraine war. The National picks out the most powerful images from the conflict. AFP -
A member of Ukraine's 79th Air Assault Brigade fires a rocket-propelled grenade at Russian positions near Marinka in February. Reuters -
Ukrainian President Volodymyr Zelenskyy addresses MPs in Westminster Hall, London, in February 2023. Getty Images -
Destroyed buildings 32km west of the front lines in Donetsk in January. Getty Images -
An anti-aircraft gun in January fires at Russian positions near Bakhmut, Donetsk. Reuters -
Destruction in the village of Bohorodychne, Donetsk. AFP -
A Ukrainian artilleryman discards an empty shell on the outskirts of Bakhmut, eastern Ukraine, in December 2022. AFP -
Children receive presents from a Ukrainian soldier dressed as Santa on Christmas Eve in Sloviansk. Getty Images -
More than 1,000 missiles and rockets fired by Russian forces collected for cataloguing in Kharkiv in December 2022. Getty Images -
The Metro provides shelter as Russia launches another missile attack on Kyiv, Ukraine's capital, in December 2022. Getty Images -
Children at a PE class in Kyiv after Russia abandoned its attempt to seize the capital in November 2022. Getty Images -
A sniper searches for Russian positions on the bank of the Dnipro river in Kherson in November 2022. Getty Images -
Graffiti by Banksy on a wall among the debris in Borodyanka in November 2022. Getty Images -
Ukrainian flags flutter around graves in a cemetery for soldiers killed in action in Kharkiv in October 2022. Getty Images -
Parts of a drone, which Ukrainian authorities said was Iranian-made, after a Russian strike in Kyiv in October 2022. Reuters -
An elderly woman is helped across a damaged bridge in Bakhmut in October 2022. Getty Images -
Fuel tanks ablaze on damaged sections of the Kerch bridge in Crimea, in October 2022. Reuters -
A destroyed bridge makes crossing the Donets river difficult, in Staryi Saltiv, east of Kharkiv, in September 2022. AFP -
Firefighters at a thermal power plant in Kharkiv damaged by a Russian missile strike in September 2022. Reuters -
Ukrainian soldier Oleksandr with his daughter Nikole at Lviv railway station in August 2022. Getty Images -
Ukrainian President Volodymyr Zelenskyy and then-British prime minister Boris Johnson read a plaque in Kyiv in August 2022 dedicated to the latter for his support. Getty Images -
Destroyed Russian military equipment on Khreshchatyk street in Kyiv. The materiel was turned into an open-air military museum ahead of Ukraine's Independence Day on August 24. AFP -
Shakhtar Donetsk v Metalist Kharkiv kicks off the Ukrainian Premier League season in August 2022 amid fears of bomb and missile alerts. EPA -
Ukrainian servicemen fire an American-made 155mm M777 howitzer in July 2022 in the Kharkiv area. EPA -
A bomb crater on the Antonovsky bridge across the Dnipro river in Kherson, July 2022. AFP -
Maksym and Andrii with plastic guns at a 'checkpoint' they set up while playing in Kharkiv, July 2022. AP -
Ukrainian troops on Snake Island in June 2022. Reuters -
A woman evacuated from an area of conflict in June 2022 contemplates what the next move might be. AP -
Romanian President Klaus Iohannis, Italian Prime Minister Mario Draghi, Ukrainian President Volodymyr Zelenskyy, French President Emmanuel Macron and German Chancellor Olaf Scholz in Kyiv in June 2022. Getty Images -
Graves in Irpin cemetery, May 2022. Getty Images -
A Ukrainian soldier trapped within the besieged Azovstal Iron and Steel Works complex in Mariupol in May 2022. Reuters -
The wreckage of a Russian helicopter in a bomb-cratered field in Biskvitne, May 2022. Getty Images -
A Ukrainian army officer inspects a grain warehouse shelled by Russian forces in May 2022 near Novovorontsovka, Kherson. Getty Images -
A boy from Mariupol arriving at an evacuation point in Zaporizhzhia in May 2022. Getty Images -
A Russian serviceman on guard outside Zaporizhzhia nuclear power station in May 2022. AFP -
Oksana searches for salvageable items on the destroyed second floor of her home in Hostomel, April 2022. Getty Images -
A floral memorial wall in Lviv for Ukrainian civilians killed during the Russian invasion, April 2022. Getty Images -
People fleeing Lviv, eastern Ukraine, in April 2022, wait for a bus that will take them to Poland. Getty Images -
A Russian soldier patrols a bombed Mariupol theatre in April 2022, as Moscow intensified its campaign to take the strategic port city. AFP -
A Ukrainian celebrates success in Hostomel in April 2022. Getty Images -
Julia Palovskaya reads to children during an air raid drill in the basement shelter at a preschool in Lviv, April 2022. Getty Images -
Volodymyr Zelenskyy in Bucha in April 2022, where hundreds of bodies were found in the street and it was claimed the Russian leadership was responsible for killing civilians. AFP -
Oleh Smolin, 23, who suffered leg injuries from Russian shelling in April 2022, in hospital in Chuhuiv. Getty Images -
Fleeing refugees arrive at the border train station of Zahony, Hungary, in March 2022. Getty Images -
A father says goodbye to his daughter on an evacuation train about to leave Odesa in March 2022. AFP -
Ukrainians under a destroyed bridge as they try to cross the Irpin river on the outskirts of Kyiv in March 2022. AP -
People cram into Kyiv station to catch trains to Poland or to western parts of Ukraine, shortly after the initial invasion in February 2022. Getty Images -
A demonstration in support of Ukraine in Trafalgar Square, London, February 2022 . Getty Images -
Russian army vehicles in Armyansk, Crimea, in February 2022. AFP -
Volodymyr Zelenskyy in Kyiv on February 25, 2022, in a video on Facebook. He said 'we are all here', shortly after the Russian invasion began. AFP -
A residential building damaged by a missile strike in Kyiv in February 2022. Getty Images -
A metro station in Kyiv in February 2022, crowded with people trying to escape the invasion. AFP -
A police officer addresses people gathered to protest against the invasion of Ukraine, in central Saint Petersburg, Russia, February 2022. AFP -
A protester in support of Ukraine, in Berlin, Germany, in February 2022. Getty Images -
Ukrainian soldiers prepare to repel an attack in Ukraine's Lugansk region on February 24, 2022. AFP -
Volodymyr Zelenskyy in Kyiv on February 24, 2022, after Russia launched a full-scale invasion. AFP -
A mass exodus from Kyiv after pre-offensive missile strikes by Russian armed forces on February 24, 2022. Getty Images -
Security personnel inspect the remains of a shell in Kyiv on February 24, 2022, soon after Russian President Vladimir Putin announced a military operation in Ukraine. AFP -
CCTV footage shows Russian military equipment crossing a Crimea border checkpoint on February 24, 2022. AFP -
Russian President Vladimir Putin in the Kremlin early on February 24, 2022, when he announced a 'military operation' in Ukraine. AFP
"And we aim to assist UN bodies and the relevant international organisations in obtaining better and more complete information on the children who were deported to Russia.
"And this includes also the children who were later adopted or transferred to Russian foster families."
Ms von der Leyen also thanked UN Secretary General Antonio Guterres, who addressed the 27 EU leaders earlier in the summit, for offering the support of UN agencies in the effort.
