You sent a link to Time magazine... Those people are not really trustworthy at all. They even had Anita Sarkeesian in their list of influencial people...
On topic: Russia has always been like this. They constantly send bombers across the norwegian border and have done so almost every day since the fall of soviet. They generally get pushed out in a matter of minutes though. So they opening military playgrounds should not come as a surprise. It is just Russia beind a nice neighbour.