Dan Walker stepped in and apologised when a Ukrainian singer swore live on BBC Breakfast.
The presenter and co-host Sally Nugent were joined by Maria Burmaka via video link from her home in Kyiv.
The musician has been putting a speaker up to the window of her apartment and singing the Ukrainian national anthem in the heart of the capital amid the Russian offensive.
She told the show: "The Ukrainian anthem is very important for all Ukrainians and I’m a musician and I decided to take my amplifier and open the window and sing to the districts.
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"My building is on one of the hills and all districts hear this anthem."
Maria said that from her window she could see Russian forces bombing the Holocaust memorial in the city and she has been taking shelter in the parking garage underneath her building, which she described as "cold and scary".
She added: "I cry and don’t want anybody to see that I cry because I have to be strong, but this is fascism.
"I ask all overlords to help us and support us, you have to know what horror is here."
Asked if she was tempted to flee Ukraine, she said: "I am staying here now, I want to stay here, many people go out of Ukraine but…I will not run from my native city, this is my home and I want to be here in the heart of Kyiv and sing for my people and maybe I will sing my national anthem again from this window."
Maria continued: “I want to say to Putin, you’re a murderer, you’re an aggressor, Ukraine was never against Russia.
"Like our soldiers say: 'F*** you.'"
Dan swiftly interrupted her to say: "I really understand the depth of feeling but I have to apologise to our viewers for the language there."
He added: "Apologies for the language there but I’m sure watching this morning you understand how strong Maria’s feelings are and so many people in Ukraine trying to defend themselves and protect their families and look after their country."
Strictly star Dan then took to Twitter to explain his apology.
"What a treat to talk to Maria Burmaka on #BBCBreakfast live from Kyiv this morning," he said.
"I had to apologise for the language at the end but that doesn’t mean you can’t empathise and understand the depth of feeling and I think 99% of people get that. Thank you for all the messages."
He added: "Thank you for all the messages."
His clarification comes as BBC Breakfast viewers were annoyed he had issued an apology before having to end the interview.
@wildbrianjones tweeted: "I can't believe that Dan Walker cut off a Ukrainian lady because she said the 'F' word on BBC Breakfast & apologised to viewers. If people are upset about her language there is something wrong with them! This lady is in a war zone! Show some sensitivity Dan!!! @BBCBreakfast."
"Dan Walker cuts off a woman expressing passionate emotions from a war zone. Has the BBC got its priorities right in putting language over suffering, pain and naked oppression? There's no problem with the apology. It's the complete silencing of her voice that's most troubling," @ESiheraESC said.
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