Warships from South Korea Navy 7th Task Group take part in a naval maneuver exercise in the East Sea off Pohang, about 370 km (230 miles) southeast of Seoul February 6, 2013. North Korea has vowed to conduct more rocket and nuclear tests in response to a U.N. censure for its launch of a long-range missile launch in December. On Tuesday, it vowed "stronger" but unspecified actions in addition to the test. The exercise began from February 6 to 12 including Lunar new year holiday. Picture taken February 6, 2013. REUTERS/Yonhap (SOUTH KOREA - Tags: POLITICS MILITARY) NO SALES. NO ARCHIVES. ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA Published: Úno. 8, 2013, 9:52 dop. | Foto: Reuters