In Russia, she is called the "savior of Ukrainian children." At the same time, Maria Lvova-Belova, and Vladimir Putin, are wanted by the International Criminal Court (ICC) in The Hague for illegally removing children from Ukraine.
In the UN Security Council, she has been booked as a speaker during Wednesday's meeting "Children and armed conflict: The crisis in Ukraine. To evacuate children from conflict zones".
"She should not be given a platform at the UN to spread disinformation," said a spokesperson for the UK delegation.
"If she wants to account for her actions, she can do so in The Hague.
Lvova-Belova: "Write to me to find your child"
Britain's decision to halt the broadcast of the meeting comes after Lvova-Belova announced on Tuesday that Ukrainian parents can "email her" if they want their children back.
"Write to me to find your child," she said during a press conference on Tuesday.
Ukraine accuses Russia of "stealing" more than 16,000 children from the country, against their parents' will, since the start of the war in 2022.
Russia: "The West is afraid of the truth"
Stopping a live webcast of an informal security meeting is extremely rare. Last month, however, China blocked the UN webcast of an informal meeting that touched on various abuses in North Korea. China then argued that the Security Council should not discuss human rights issues.
It was the first time that any member of the Council objected to a webcast, which requires permission from all 15 members.
On April 4, Dimitry Polyanskiy, Russia's envoy to the United Nations, tweeted that Russia would find an "alternative way to offer live coverage of the meeting."
"The West is clearly afraid that many people will finally hear the truth about this subject," he wrote.
Listen to SVT's Ukraine correspondent talk about Maria Lvova-Belova in the video above.
Javascript is disabled
Javascript must be turned on to play video
Learn more about browser support
Listen to SVT's foreign reporter Carl Fridh Kleberg explain the importance of the ICC's arrest warrant against Russian President Vladimir Putin. Photo: SVT/TT/AP