Two Hungarian Gripen fighter jets were scrambled on September 25 from Šiauliai Air Base in Lithuania as part of NATO’s Baltic Air Policing mission, NATO Air Command reported on September 25.
The jets intercepted a formation of Russian aircraft—including a Su-30, a Su-35, and three MiG-31s—flying near Latvian airspace.
Any incursion of a military into another country’s territory without that country’s permission is considered an attack and therefore very carefully avoided by all militaries.
If it happens, it is intentional. (At least if it happens for more than a minute or so. In this case, the planes have been flying in the countries’ territories for about 10 minutes or so. And that’s a long time. And unambiguously intentional.)