A British national has been killed in Ukraine and a second is missing.
The families of both British nationals are being supported, a spokesperson at the Foreign Office said.
Sky News reported that the pair may have been volunteers fighting against Russian forces, but this has not been confirmed.
In a statement the Foreign Office said: “We can confirm that a British national has been killed in Ukraine and are supporting their family.”
On the missing person, the spokesperson said: “We are aware of a British national who is missing in Ukraine and are supporting their family. We are urgently seeking further information.”
Tributes have been paid to Scott Sibley after he was named by the BBC and Sky, both of which said he is believed to have been fighting in support of Ukrainian forces.
A small number of serving British personnel are believed to have gone absent without leave to join the resistance against the Russian invasion, while veterans and Britons without combat experience are thought to have also travelled to Ukraine.
There was initially confusion on the Government’s position after Foreign Secretary Liz Truss, in comments during an interview to the BBC on February 26, said she would “absolutely” support UK nationals who chose to fight for Ukraine.
However, she later rowed back on those comments, insisting she had been “expressing support for the Ukrainian cause” in her remarks, and that there are “better ways” to contribute to the country’s defence.