It is extremely difficult to compare furlough schemes between countries, as each varies so much in scale, scope, and number of eligible people. But fact-checking service Channel 4 FactCheck analysed a previous, almost identical, claim made by the Prime Minister, and concluded that it is “almost impossible to say which country has the most generous furlough scheme”. For their full analysis, see here.
We are in the dark about what evidence Mr Johnson was relying on. We emailed Downing Street requesting evidence to support this claim, but received no response.