It comes as uncertainty over how long Western aid for Ukraine will continue deepens after Donald Trump’s US election win.

The Duchess of Gloucester has attended Westminster Abbey’s Field of Remembrance ceremony in place of the Queen, who is unwell, to commemorate members of the armed forces who have lost their lives.

The Swedish teenagers, aged 17 and 19, were arrested in early October after two hand grenades were thrown at the embassy in Demark.