Why Britain occupied Iceland after Germany took Norway

Why did Britain occupy Iceland during World War II, and how did Iceland react?

Britain feared Germany could seize undefended Iceland after taking Norway, while Icelanders objected and lodged formal protests.

Britain's occupation is explained as a pre-emptive response to Germany's move into Norway. Iceland had no standing armed forces, leaving British planners fearful that a small German deployment could seize an important North Atlantic position with little resistance. German access to the Norwegian coast made movement into the Atlantic a more immediate concern. Icelanders were unhappy and filed formal protests, so the episode remains an imposed strategic occupation rather than consensual protection.