France, March 20 -- Dozens of military chiefs from countries keen to help protect an eventual ceasefire between Russia and Ukraine will meet in Britain on Thursday to discuss planning for a peacekeeping force.

UK Prime Minister Keir Starmer, co-leader of efforts to form the so-called coalition of the willing alongside French President Emmanuel Macron, is expected to address the meeting of roughly 30 military officials.

It comes amid huge questions over what the group can do after Russian President Vladimir Putin demanded an end to Western military aid to Ukraine as a condition for any end to fighting.

Russia has also ruled out accepting any foreign troops on Ukrainian soil as part of a ceasefire agreement.

Starmer and Macron have been...