US President Joe Biden has welcomed the International Criminal Court's issuing of an arrest warrant against his Russian counterpart, Vladimir Putin.
The ICC accused President Putin of committing war crimes in Ukraine - something President Biden said the Russian leader had "clearly" done.
The claims focus on the unlawful deportation of children from Ukraine to Russia since Moscow's invasion in 2022.
Moscow has denied the allegations and denounced the warrants as "outrageous".
It is highly unlikely that much will come of the move, as the ICC has no powers to arrest suspects without the cooperation of a country's government.
Russia is not an ICC member country, meaning the court, located in The Hague, has no authority there.
However, it could affect Mr Putin in other ways, such as being unable to travel internationally. He could now be arrested if he sets foot in any of the court's 123 member states.
Putin is only the third president to be issued with an ICC arrest warrant.
President Biden said that, while the court also held no sway in the US, the issuing of the warrant "makes a very strong point".
"He's clearly committed war crimes," he told reporters.
His administration had earlier "formally determined" that Russia had committed war crimes during the conflict in Ukraine, with Vice-President Kamala Harris saying in February that those involved would "be held to account".
The United Nations also released a report earlier this week that found Moscow's forced removal of Ukrainian children to areas under its control amounted to a war crime.
In a statement on Friday, the ICC said it had reasonable grounds to believe Putin committed the criminal acts directly, as well as working with others. It also accused him of failing to use his presidential powers to stop children being deported.
Russia's commissioner for children's rights, Maria Lvova-Belova, is also wanted by the ICC for the same crimes.
ICC prosecutor Karim Khan has said the warrants were "based upon forensic evidence, scrutiny and what's been said by those two individuals".
The court had initially considered keeping the arrest warrants a secret, but decided to make them public to try and stop further crimes being committed.
"Children can't be treated as the spoils of war, they can't be deported," Khan told the BBC.
"This type of crime doesn't need one to be a lawyer, one needs to be a human being to know how egregious it is."