That suggests to me that these drones are being launched from different directions much closer to Moscow. The Russians might now be expected to be bringing these drones down just after they leave the Ukrainian border given that they know most are bound for Moscow.

And Moscow is protected by three separate and overlapping Pantsir air defence systems, which have good radar coverage.

Since then, almost all attacks have been directed towards Moscow, yet none has been brought down in the 300-plus mile distance from the nearest part of the Ukrainian border to the Russian capital. That's a very good question, which I have asking myself since the first attack on the Kremlin on 3 May. Our security and defence analyst Professor Michael Clarke responds. Today's question comes from Bedfordshire Boy, who asks: 'Is it feasible for drones launched from Ukraine to remain undetected by Russian defence forces until they reach Moscow? This is a distance of about 300 miles!' We've been putting your questions on the war in Ukraine to our analysts and foreign correspondents.

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