RAF transport planes taking missiles to Ukraine made a 200-mile detour to avoid German air space.
The action fuels fears of a Nato split on how to respond to Moscow’s aggression.
London and Berlin insisted there was no dispute between each other with German officials saying: “This was entirely a British decision.”
C-17 cargo planes loaded with hi-tech anti-tank weapons took off from Brize Norton, Oxon, but flew over Denmark before heading for Kiev.
Under Nato rules, countries need permission to fly ammunition through another’s air-space.
多于 100,000 Russian troops are massed on Ukraine’s borders along with tanks, missiles and fighting vehicles.
Moscow yesterday confirmed more troops were heading to Belarus, which borders Ukraine, for an exercise.
But the US warned Russia may attack Ukraine “at any point”.
The White House added the situation is “extremely dangerous”.
Foreign Secretary Liz Truss and Defence Secretary Ben Wallace flew to Australia to unveil an alliance to meet threats from China.