War is not something that can be controlled once it breaks out. Non-aligned militaries that come into close proximity is something that's very dangerous. At the very least an incident between militaries can cause a diplomatic crisis or at worst start a minor war. The very presence of military forces in the Baltic is a deterrent for that reason.
Also Russia has continually violated Swedens air space. Russian pilots have acted aggressively towards Swedish pilots and Russian submarines have been spotted in Swedish waters.
So while Russia may not be plotting a war against Sweden, they are certainly stirring up trouble. Furthermore a war in the Baltic would be a disaster for Europe. If Russia perceives that they risk a wider war, they may back down.
Also Russia has continually violated Swedens air space. Russian pilots have acted aggressively towards Swedish pilots and Russian submarines have been spotted in Swedish waters.
So while Russia may not be plotting a war against Sweden, they are certainly stirring up trouble. Furthermore a war in the Baltic would be a disaster for Europe. If Russia perceives that they risk a wider war, they may back down.