Could Russian submarines cut off the internet?
bbc.com
bbc.com
Instead of blocking, they allow the traffic to flow, and then implement surveillance. They have learned from silicon valley companies the value of data.
(The "education" of the citizens is then done another way, but that's a whole other story.)
Could Russia spy the whole world ?
The implicit assumption (made by me) is that the US (or perhaps UK on the behalf of the US) planted it there just in case. It certainly wasn't Germany or Russia...
http://www.thelocal.se/20151107/explosive-sub-found-near-rus...
Side-note: This "ally" thing is odd. Germany and Sweden provides the US with intelligence in exchange for intelligence and trade contracts. Germany spies on Sweden. Sweden finds a threat that could threaten gas supply from Russia to Germany and exposes it to the world. Sweden implements an internet surveillance program aimed at domestic arabs but also russian internet traffic flowing through Sweden, to trade with the US for intelligence/favors. US plants a bomb in order to be able to kill critical energy supply to Germany.
Why would the US want to do anything to Germany anyway? They are one of our strongest allies in the region and house some of our largest military bases outside of the US. The German politicians were publicly appalled at our spying but I feel thats only a show for the public. Business will go on as usual.
You can't imagine a future situation where Germany would have to choose between alignment with the US or Russia, and short-term energy supply being a factor?
Who else would have the both the capability and interest to place such a UAV/remotely controlled explosion device there?
I would even say it would be incompetent of the US administration/military not to prepare for situations like these.
At the same time Nord Stream can used as an excuse to strengthen the Russian military presence on the Baltic Sea. In this sense the discovery of a UAV is strongly in favor of Russia.
North Stream allows Russia to excuse the military presence on Baltic Sea (to protect the pipe but also cut of aid to Nato allies over the sea).
Therefore finding anything that shows threat to the pipe is in favor of Russia.
Of course this might have multiple levels. It was planted by US/UK, Russia strengthens military presence close to Sweden, Sweden moves closer to the Nato alliance.
I am no expert in this area but I think that your understanding is a bit too simplistic.
I'd be willing to bet every superpower has a remote cut box on each others' cables, ready to go in the event of a digital war, kind of a mutually assured silence.
If all cables were cut and we went back to satellite we'd essentially be back to UUCP for worldwide datacomms for the general public.
Speaking directly to communications satellites, they likely would not be immune to any conflict that affects underwater cables. US, Russia, and China all are rumored to have anti-satellite weapons and Russia has been steering satellites (spy or ASAT no one seems to know) around commercial telecom satellites
Satellites are either geostationary or not. If they are not geostationary you need a network of them and complex ground equipment. If they are geostationary, they incur a ping latency of a few hundred milliseconds making them worthless for modern mass Internet usage. Either way, bandwidth is quite limited compared to what is flowing through fibers today.
Also: I am pretty certain US, Russia and China by now are able to kill satellites at will, geostationary or not.
https://en.wikipedia.org/wiki/2007_Chinese_anti-satellite_mi...
The US did their test in 1985. At this point, shooting down satellites is easy, but it has big consequences. The more debris we create, the harder it is to keep satellites up there.
Or astronauts, space stations, deep space probes, etc...
Just ask George Clooney ;P