They have always done their missile testing in the North Sea. Norway had been notified in advance.
If it had not failed no one would have noticed - hardly a great way to intimidate world leaders.
Does anyone think that the US is not still carrying on secret ICBM testing?
Agreed.
But, we are talking about Putin here...so you never know
(and yes, I know that technically he isn't president of Russia...but we all know who runs the show over there).