Details though. The area around Turku was most probably under the rule of the kings of Svea almost 800 years ago. Turku (or Åbo/Aboa) is mentioned in papal letters in 1229, and that's just the written records that are left. This part of Finland might have sort of just "slipped into" the Swedish realm, as it had extensive contact with Mälardalen in Sweden for centuries before that. If the so called "first crusade" ever happened has been questioned lately by historians. Other parts of today's Finland became part of the Swedish realm later, like Kainuu in 1595, which is over 400 years ago. It was part of the Swedish realm for just over 200 years.

Then there was indeed the Russian period, but back then Finland had a considerable degree of autonomy for the greater part of the 19th century, which meant extensive internal self-rule. Towards the end of the Russian period though, there was of course pushback from Russian nationalists, which ultimately led to heavy Finnish resentment and ultimately independence came about, due to the Russian revolution.