Officials say UK not prepared to deploy troops to frontline with Russia as head of armed forces prepares to meet US counterparts in Washington

The head of the British armed forces will tell his American counterpartsthe UK was prepared to send troops to defend Ukraine’s skies and seas but not to the frontline with Russia, as planning intensifies for a postwar settlement.

Tony Radakin, the chief of the defence staff, will on Wednesday attend meetings at the Pentagon designed to finalise what 30 different countries are willing to commit to Ukraine’s national security.

Radakin is expected to confirm the UK will provide soldiers to help with logistical support and training, but not deploy them close to Russia. Officials had been talking about deploying as many as 30,000 troops to protect Ukrainian sites, but that has been scaled back amid opposition from some European countries.

One British official said: “Wednesday is a really important moment. Nothing happens in Washington without the president giving the green light, so Trump giving his support to security guarantees on Monday kickstarted a lot of activity.”