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South Korean military said it was on high alert and coordinating closely with the United States.
President Joe Biden said he had issued an order on Wednesday to take down the balloon, but the Pentagon had recommended waiting until it could be done over open water to safeguard civilians.
South Korea's President Yoon Suk-yeol, during phone calls with military chiefs, called for "solid mental readiness and practical training" to ensure any North Korean provocations will be met with retaliation, according to a statement from his office.
The warship is packed with sophisticated state-of-the-art weapons and sensors such as surface-to-surface missiles and surface-to-air missiles.
The North's missile launch comes just days after the country tested a high-thrust solid-fuel engine that experts said would allow quicker and more mobile launch of ballistic missiles, as it seeks to develop a new strategic weapon and speed up its nuclear and missile programmes.
The central city of Poltava and parts of Kyiv were among areas where power was knocked out, and critical infrastructure was hit in the eastern region of Kharkiv, the Black Sea region of Odesa and in Vinnytsia in west central Ukraine.
North Korea also on Monday fired around 130 artillery rounds into waters near the buffer zones with South Korea, while accusing the South of raising unnecessary tension in front-line areas.
Despite an initial government warning that a missile had overflown Japan, Tokyo later said that was incorrect.
Both fell outside Japan's exclusive economic zone, and authorities were looking into what kind of missiles were launched, including the possibility that they were submarine-launched ballistic missiles.
Nuclear-armed North Korea test-fired an intermediate-range ballistic missile farther than ever before on Tuesday, sending it soaring over Japan for the first time in five years.