thumb|upright=1.35|Map of the first phase of Operation Barbarossa on 25 August, 1941
I cannot write an accurate overview based solely on this context, as it only shows a caption referring to Operation Barbarossa without providing substantive information about what an invasion is or why it matters. To fulfill your request properly, I would need additional source material with actual explanatory content.
AI-generated from the Wikipedia summary — may contain errors.
thumb|upright=1.35|Map of the first phase of Operation Barbarossa on 25 August, 1941
In geopolitics, an invasion typically refers to a military offensive in which a polity sends combatants, usually in large numbers, to forcefully enter the territory of another polity, with either side possibly being supported by one or more allies. While strategic goals for an invasion can be numerous and complex in nature, the foremost tactical objective normally involves militarily occupying part or all of the invaded polity's territory. Today, if a polity conducts an invasion without having been attacked by their opponent beforehand, it is widely considered to constitute an international crime and condemned as an act of aggression.
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