Another pointless war's coming. :(
I think it is far more likely that this is just a coincidence.
But again, 4 times...
There is definitely something strange going on.
I don't buy the "test to see if they could actually cut this many cables simultaneously" idea. Cutting cables is not fundamentally difficult -- they are not even armored below a certain depth. It would also be a very expensive, complicated, and potentially embarrassing test.
However, your conspiracy theory seems way too easy. But, maybe our government is just that sneaky...