The United Kingdom and France have agreed in principle to deploy troops in Ukraine if a peace deal with Russia is reached, marking a significant step in European security planning. Keir Starmer said the declaration of intent would allow British, French and partner forces to operate across Ukraine to deter future aggression, while Emmanuel Macron suggested thousands of troops could be involved. Allies meeting in Paris broadly agreed on the need for robust security guarantees, with the USA expected to lead monitoring of any ceasefire. However, major questions remain unresolved, particularly over territory occupied by Russia and the precise terms of enforcement. Moscow has warned foreign troops would be legitimate targets and has so far remained silent on the proposals. Volodymyr Zelensky, who said on 1 January that a peace deal was ‘90% ready’, welcomed the talks as progress but stressed that guarantees would only matter if they truly ended the war, as pressure grows on all sides to compromise.