Following the announcement of FBK quitting the network, a spokesperson at Grant Thornton said: ‘Like many international organisations around the world, we will continue to evaluate what further actions are needed as the situation evolves.

‘We are shocked and saddened by the events in Ukraine and our focus at Grant Thornton continues to be on supporting our colleagues at this very difficult time. Grant Thornton Ukraine is receiving offers of support from Grant Thornton firms around the world and our thoughts remain with our colleagues and their families in Ukraine at this distressing time.’

Meantime, Deloitte has closed its offices in Ukraine on a temporary basis.