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SEOUL, South Korea – North Korea fired three short-range guided missiles into its eastern waters on Saturday, a South Korean official said. It routinely tests such missiles, but the latest launches came during a period of tentative diplomacy aimed at easing tensions.

The North fired two missiles Saturday morning and another in the afternoon, South Korean Defense Ministry spokesman Kim Min-seok said by phone. He said the North’s intent was unclear. His ministry said it is watching North Korea carefully in case it conducts a provocation against South Korea.

In March, North Korea launched what appeared to be two KN-02 missiles off its east coast. Experts believe the country is trying to improve the range and accuracy of its arsenal.

North Korea recently withdrew two mid-range “Musudan” missiles believed to be capable of reaching Guam after moving them to its east coast earlier this year, U.S. officials said. The North is banned from testing ballistic missiles under U.N. Security Council resolutions.

Earlier this year, North Korea threatened nuclear strikes on Seoul and Washington because of annual U.S.-South Korean military drills and U.N. sanctions imposed over its third nuclear test in February. The drills ended late last month. This past month, the U.S. and South Korea ended another round of naval drills involving a nuclear-powered aircraft carrier off the east coast. North Korea calls such drills preparation to invade the North.

Analysts say the recent North Korean threats were partly an attempt to push Washington to agree to disarmament-for-aid talks.

In response to Saturday’s missile test, the U.S. said threats or provocations will only further isolate North Korea from the rest of the world and undermine international efforts to bring peace and stability to Northeast Asia.

“We continue to urge the North Korean leadership to heed President Obama’s call to choose the path of peace and come into compliance with its international obligations,” said National Security Council spokeswoman Caitlin Hayden.

On Monday, North Korean state media showed that the country’s hard-line defense minister had been replaced by a little-known army general. Outside analysts said it was part of leader Kim Jong Un’s efforts to tighten his grip on the powerful military after his father Kim Jong Il died in December 2011.

North Korea possesses an array of missiles. U.S. and South Korean officials do not believe the North’s claim that it has developed nuclear warheads small enough to place on a missile. Last week in Washington, South Korean President Park Geun-hye and President Obama warned North Korea against further nuclear provocations.

Tension between the two Koreas remains high after both sides pulled out their workers from a jointly run factory complex earlier this year. The countries remain technically at war after the 1950-53 Korean War ended in a truce instead of a peace treaty.