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Do you think country-wide jamming of a high-power radio signal is easy? The magnitude of difference between jamming a building and jamming at airline altitudes or at long distances is massive. You don't just go out and buy a jammer that blocks GPS for a country.
I don’t think that for an individual it is easy. But for a country as large as Russia (even with a somewhat pathetic economy)
I work developing the next generation GPS satellites, and half of my job is dealing with defeating jamming. Without giving specifics that can only be shared in a SCIF, jammers are for small regional use, not for large scale usage. RF power drops off at 1/r^2, so doubling the distance requires 4 times the power. A normal person can buy a jammer that handles a few hundred feet around their house or car. It is 100x harder to cover a city block of buildings and is mostly restricted to governments (my math could be off on that, since RF isn't my specialty). Going from jamming a city block of government buildings to jamming flight traffic in a small neighborhood is roughly 100 times as much as that power. Going from that small neighborhood to blocking a very small country is 100 times as much as that power (or 10,000 as much as the power of a big jammer). Doing the same thing but with multiple RF signals is even harder.
I can't talk about Russia's specific capabilities, but even for Russia it wouldn't be easy outside a small region.