How would capturing a satellite from orbit be any different than a soldier walking up to an enemy's position and driving off with a tank or flying a jet out from under their nose? Some shit would definitely be on the fan at that point.
A better analogy might be detaining a ship or in international waters or implementing a blockade such as the Cuban missile crisis. It is technically casus belli, but rarely does it get escalated that far. Rational actors don't really want to start a war over an incident that doesn't even involve their sovereign territory.
I don't think a blockade is the same thing though. A blockade just prevents a ship from going to the destination or the route it was wanting. It is still free to maneuver and is still in control of the flag it operates under.
