Could a partial month-long truce between Russia and Ukraine be the key to unlocking a lasting peace between the two sides?
President Emmanuel Macron of France believes so and he floated the idea during Sunday's summit of European leaders in London.
In an interview with Le Figaro newspaper, he proposed a four-week truce "in the air, at sea and on energy infrastructure". It would not cover ground fighting along the front line in the east.
"In the event of a ceasefire, it would be very difficult to verify [a truce] along the front was being respected," Macron told the newspaper.