It is understood Sky Shield has been drawn up by former RAF planners working in conjunction with Ukraine’s armed forces, and it has been canvassed before European defence ministries. However, there has been no real appetite from European leaders to sanction patrols of Ukrainian skies while the war is ongoing.

Those involved believe the pace of events in the last week means that ideas about protecting some of Ukraine’s airspace can now get a fresh hearing, though the plan also serves to highlight how important and efficient air protection would be as part of providing security guarantees to Kyiv in the event of a ceasefire.