Ten jets shot down in ten days: Russia's army loses air sovereignty - but a mystery remains. The Ukrainians continue to report military successes, such as a HIMARS attack on a Russian training area that was devastating for Putin's troops.

“How the Ukrainians shoot down so many jets is unclear,” commented the American news magazine Forbes on the latest rate of shootings. One possibility is that the Ukrainian Air Force has strategically deployed US-made Patriot anti-aircraft systems along the front lines - rather than exclusively around critical infrastructure in major cities.