Loads of countries have been doing shit like this for years. Turkish planes do it to the Greeks, US/UK do it to Lebanon and Palestine, China does it to Taiwan, The US does it to China, India and Pakistan probably do it too.
Not that it’s a good thing, but they’re just testing the detection and interception of NATO. Russia uses standoff weapons which it can deploy from its own airspace, so they don’t have much use flying beyond their borders unless it’s to cause annoyance to neighbouring air patrols.
Not worth the panicked headlines over.
That’s a different scenario. That was over Syrian/Turkish airspace and Russia likely knew they don’t have a leg to stand on there considering the close vicinity of the border and conflicting reports over the bomber’s flight path. Not to mention that Turkey is a lot closer to Russia than the average NATO state.
I don’t think it could escalate to a full war, but shooting down aircraft in intl. airspace is much more serious than a bomber that has strayed into your national airspace.