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And such systems have been tested and found to somewhat effective.
One of the original SDI proposals was an x-ray laser in space, but it was to be powered by a nuclear weapon, and it was tested maybe just 1-2 times, in underground nuclear explosions. The other SDI proposal would use hundreds or thousands of highly maneuverable satellites that would shoot high velocity BBs at warheads. It's unlikely either system would have been highly effective against a large scale attack, and there was the legal issue of deploying weapons in space in violation of UN law to which the US had agreed. To get around the latter it was proposed to launch the defensive satellites when attack was detected, but such launches could be indistinguishable from an ICBM attack by the US.
Earlier defense systems relied on intercepting warheads anywhere from 10-400 miles up in the air with missiles, and apparently this required the interceptors to use nuclear warheads themselves to be effective.
The idea of an electromagnetic pulse device to prevent a nuclear weapon from being triggered may not work because the electronics of the weapons may be resistant to that because the electronics of the interceptor missiles developed in the 1960s were -- the Spartan interceptor was actually designed to be guided from the ground and operate despite interference from EMP created by enemy nuclear explosions.
What we forget is that IF any of these UFOs people are seeing belong to our military, then we already have access to immense power and probably the use of this power.
I suspect that nuclear is already old technology and so the superpowers have moved beyond this form of weaponry. However as noted, there are many organisations and smaller countries which do not have an alternative to nuclear so it becomes a matter of detecting and protecting.
Of course, this is all only speculation but it would make sense if some of these UFOs are US/Russian/Chinese.
Fission and boosted-fission and fusion-fission reactions are unmatched except by nature. Anything that releases energy at that rate or better shows on public-sector earthquake sensors.
If you want to talk about future weapons then you want to talk about chemical lasers, RF research related to human biology, metamaterials, elemental biology(precision mortality and sickness) etc..
Most countries just use hacking and data collection now because it's easier to hide from their own populations where they have more control over propaganda and content. Most countries have things like weaponized small pocks that are way more dangerous than 15 mile destructive radius and wind-stream fallout.
There is no defense against a MRV'd SBLM and a single ballistic sub carries enough of them to level most cities in a country. The Soviets and the USA spent 7 decades developing the technology with almost unlimited budgets and it would take nearly as long to find some sort of defense. If a single sub did a full release, humanity would be in a very different state a few hours later. This is the power of this technology.
They don't spend money on that much new development now because there is no point. The world can only be blown up once.
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