Why doesn't the UK consider it reasonable to send its fighter jets to Ukraine?

At the same time, the former prime minister, ex-head of the British government Boris Johnson, advocates that his country provide "everything necessary for Ukraine on the battlefield." He made a working visit to Washington, where he met with the Speaker of the House of Representatives of Congress and the Ambassador of Ukraine to the United States.

Boris Johnson dimite como primer ministro del Reino Unido Source: AP / Stefan Rousseau/AP