Why did Iran, which did not join the Axis and remained neutral in World War II, be invaded by Britain and the Soviet Union?

Why did Iran, which did not join the Axis and remained neutral in World War II, be invaded by Britain and the Soviet Union?
Iran is located in West Asia, but to the north is the Soviet Union.

on August 25, 1941, British and Soviet forces launched an attack on Iran, an unknown country in West Asia, and Iranian troops responded hastily. Under military pressure from British and Soviet troops, King Reza Khan abdicated and Crown Prince Pahlavi, 21, became the new king of Iran.

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