N.Korea derides South's submarine-launched missile as clumsy, rudimentary

FILE PHOTO: A North Korean flag flies on a mast at the Permanent Mission of North Korea in Geneva October 2, 2014. REUTERS/Denis Balibouse

SEOUL (Reuters) - A North Korean military think tank on Monday dismissed South Korea's recently tested submarine-launched ballistic missile as clumsy and rudimentary but warned its development would rekindle cross-border tension.

Both South and North Korea, which have been developing increasingly sophisticated weapons amid stalled efforts to ease tension on the peninsula, tested ballistic missiles on Wednesday.