Well, true, Russia has a long history so I was overly broad. Aggressor in almost all conflicts is more accurate.
In WW2 it was the second major aggressor of course. WW1 Germany declared war before Russia invaded, so debatable. Wasn't an aggressor in the Napoleonic wars as far as my history knowledge serves me.
https://en.wikipedia.org/wiki/Time_of_Troubles and Polish invasion it the most notable event I guess.
But - sure, in most other cases Russia in either an invader or a part of a larger conflict for influence, like https://en.wikipedia.org/wiki/Seven_Years%27_War or Napoleonic Wars.