I find it kind of disturbing with guys like Putin in charge that they act like the "Soviet Era" and it's mentality is a thing of the past, while still reacting this way, and with so much ignorance. It's pretty much back to square one.
That said a US weapon test makes little sense (though being a test would explain why it hit such a remote location) truthfully we'd be more likely to want to "test" on something like North Korea, China, or The Middle East, than on Russia, which is annoying, but hardly our #1 priority.
Skepticism is however always healthy and I wouldn't entirely dismiss the idea of it not being an actual meteor or exactly as it seems. Plenty of wierd stuff happens during disasters. For example people tend to forget that The Pentagon was also hit during the 9/11 attacks in the US and there have been some creepy cover ups about that side of things, while the media tends to mostly focus on The World Trade center, although The Pentagon being hit is actually a much bigger deal in the scheme of things. When I say "creepy cover ups" there are bits about people having seen odd things (like missles, or energy pulses) flying at a low altitude towards The Pentagon. While few people have been able to prove that, they were able to prove that the goverment did run around and confiscate pretty much every video tape and record around the site, including those that weren't exactly next to the impact location, and aimed at levels that are totally irrelevent to the idea of a plane crash. I'm not saying it nessicarly means anything... but the way the goverment acts it pretty much makes everything look like a bloody conspiricy.
I'd also point out that meteor bombardment was an old strategy during the cold war, basically the super powers had tons of eyes on each other directed towards placing missles or actual manufactured weapons in space. As any science fiction fan can tell you, one of the best ways of wiping out a planet is to fire meteors or aserroids at it. Apparently during The Cold War there was a lot said about the powers basically modifying existing satellites to either intentionally crash into the planet for a more limited impact (instead of a missle) or to put "peaceful research cargos" up into space that could secretly be deployed for a similar effect. Basically you put geological samples up into space to research the effects of zero gravity on whatever, in reality it's a huge honking chunk of mineral that will survive atmospheric re-entry with enough mass and speed to do damage that can be dropped from the satellite.
Now, I am NOT saying this is what happened, but when it comes to paranoid, consider that if Russia had actually done something like this, one of their best moves post-cold war would be to move the satellite(s) into an orbit over their own territory where they would attract less attention, and also still be up there if things changed and they wanted to use them later (and also to avoid attracting attention by taking them down and admitting what they did). Putting something like this over sparsely populated areas like Siberia in case of a malfunction would make sense, and to be honest given the general quality of vintage soviet engineering a malfunction would be inevitable, especially in the
long term since they probably didn't originally anticipate just leaving these things sitting there for decades on end like actually happened... I mean assuming this happened at all.
The point here being that in many cases truth is stranger than fiction, some of the garbage outed after The Cold War (never mind what goverments are still sitting on) is absolutly borked. You basically had mad scientists planning out doomsday weapons on both sides of the equasion. As any relatively informed person will tell you, with the time to develop new stuff nukes are probably the least of our worries since they are like 60+ years old now. Anyone who thinks militry technology peaked there and didn't move on, while the rest of civilization did is kind of naive. As guys like Robert Heinlan kind of pointed out real war usually comes down to "X weapons" X standing for unknown, whoever innovates the most winds up winning, and people even plan for this during peacetime. A-Bombs/Nukes were pretty much the defining X weapon of their day, being a big deal at the time. During The Cold War, neither the US or USSR was really content with a nuclear stalemate and were looking for anything they could get for an advantage.
Just some food for thought, Occam's Razor would propose that a meteor strike is the most likely culprit, since stuff like that does happen, and it was inevitable we'd see things like this. However there is plenty of room for it to be other things to the point where conspiricy theories aren't entirely out of line, since there is plenty of fuel for it beyond the obvious ridiculousness like a premeditated attack, or aliens chucking rocks for whatever reason.