UPDATE 1-S.Korea's Iran crude imports for May more than double on year

* Iran May crude imports 1.26 mln tonnes vs 541,510 year

earlier

* Jan-May oil imports from Iran more than double from year

before

* Total crude imports in May down 4 pct

(Add detail, background)

By Nataly Pak and Jee Heun Kahng

SEOUL, June 15 (Reuters) - South Korea's imports of Iranian

crude oil jumped around 130 percent in May from the same month a

year ago, extending gains after international sanctions were

lifted in January on Iran's disputed nuclear programme.

Seoul b

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