SEOUL, Feb 20 (Reuters) - North Korea fired two more ballistic missiles off its east coast on Monday, as the powerful sister of leader Kim Jong Un warned U.S. forces to halt military drills, saying the reclusive nuclear state could turn the Pacific into a "firing range".

The launches come just two days after North Korea fired an intercontinental ballistic missile (ICBM) into the sea off Japan's west coast, prompting the United States to hold joint air exercises with South Korea and separately with Japan on Sunday.

North Korea's state media confirmed it fired two projectiles from a multiple rocket launcher, aiming at targets 395 km (245 miles) and 337 km (209 miles) away, respectively.

"The 600mm multiple rocket launcher mobilised in the firing... is a means of tactical nuclear weapon," capable of "paralysing" an enemy airfield, state news agency KCNA said.

Japan's Defense Ministry said the two ballistic missiles, fired around 2200 GMT, reached a maximum altitude of about 100 km and 50 km, travelling a distance of about 350-400 km before falling outside Japan's EEZ.

There were no reports of damage to aircraft or vessels.

In a statement, the ministry said it would continue to gather and analyse information in close cooperation with the United States.

"North Korea's series of actions, including its repeated ballistic missile launches, threaten the peace and security of Japan, the region, and the international community," the ministry said. "Japan lodged a strong protest and forcefully condemned North Korea."