The widower of a British woman killed in a Russian plane crash said it was a "very difficult and emotional time" as her family tries to come to terms with the shock and loss.
Robert Crome said Donna Bull was "a wonderful mother" to her children George and Kate, and "kind, thoughtful and caring" to her friends and family".
He said in a statement today: "She was also a dedicated and hard-working professional, as a teacher and educationalist, so her students will all miss her greatly. Words are inadequate to express our grief and loss.
"We hope that the UK and Russian authorities can help to ease any administrative difficulties. We extend our heartfelt sympathies to all those families in Russia who too have lost their loved ones in this tragedy."