Pilots and ship captains will have to navigate the old fashioned way, and I could be wrong but I believe radio is still the default for communications, weather reports etc. so i’m curious what i’m missing besides Google Maps not holding my hand to the grocery store. an economic impact surely, but life as we know it?
Most location services on a phone are performed using WiFi and cellular data rather than GPS except in remote areas. With modern technology an array of autonomous radio transmitter buoys could give the same accuracy as GPS.
Logistics would suffer at least on the short term but I'm sure ground based technology would be sufficient in the long run. As long as your in a populated area your phone would know where you are.
Hundreds of millions of people rely on satellite internet for income, education, entertainment, social life.
The world wouldn't end but it would definitely be worse.
Just to note, there's literally nothing of this form currently existing or possible - international law consists of treaties to which the countries have agreed, so such a treaty forbidding something would be binding to Russia if and only if Russia agrees to sign the treaty. In international law, sovereignty is the ultimate power, authority and/or jurisdiction over a people and a territory.
Like, there is treaty forbidding landmines, but it don't forbid landmines to those who haven't signed it e.g. Russia, USA and China; there's a treaty prohibiting proliferation of nuclear weapons, which does not prohibit it to those who haven't signed e.g. India, Pakistan and Israel, and so on.
Countries are sovereign and have full rights of self-determination, there isn't any world government that would be somehow superior to the countries and there are no ways to pass some "international law" to forbid them something unless they choose to. Well, unless you can "motivate" that choice which credible threats of excessive violence, but that doesn't apply to countries who have the nuclear veto power.
International law is a cute little thing, much like club rules at the country club. With the absence of a Leviathan, often broken and worse: unenforceable against most influential participants.