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Putin found a way of achieving that at a couple of points in time.

Why can't it be jammed? Can't any radio signal can be jammed by a stronger one?

The way it's been presented in other threads is that the narrow beam makes it quite difficult to jam at scale.

> If it could be "jammed" like that Russia would "jam" the Ukranian ones.

They did, though, in a few places? It was reported as such anyway, again this is not something I'm an expert on.