WASHINGTON — A federal judge on Nov. 23 entered a $44 million judgment against Iran in litigation that McKesson Corp. brought over its financial interest in an Iranian dairy.

Following the Iranian revolution in 1979, McKesson sued Iran in Washington’s federal trial court over allegations that Iran illegally withheld dividends the dairy issued and expropriated the company’s 31% interest in the dairy. The suit has dragged on for 28 years.