By Hyunsu Yim and Josh Smith
SEOUL (Reuters) -North&nbsp;Korea&nbsp;launched a&nbsp;long-range&nbsp;ballistic&nbsp;missile&nbsp;into the sea off Japan's west coast on Saturday&nbsp;after&nbsp;warning&nbsp;of a strong response to upcoming&nbsp;military&nbsp;drills&nbsp;by South&nbsp;Korea&nbsp;and the United States.
Japanese authorities said the&nbsp;missile&nbsp;plunged into waters inside Japan's exclusive economic zone more than an hour&nbsp;after&nbsp;it was launched, suggesting the weapon was one of Pyongyang's largest&nbsp;missiles.
Japanese Prime Minister Fumio Kisihda said the&nbsp;missile&nbsp;appeared to have been ICBM-class, referring to an intercontinental ballistic&nbsp;missile. He told a briefing Japan strongly condemned the launch, calling it a threat to the international community.
Defence Minister Yasukazu Hamada said the&nbsp;missile&nbsp;appeared to have a&nbsp;range&nbsp;of more than 14,000 km (8,700 miles) - sufficient to reach the U.S. mainland.
Tokyo said there were no immediate reports of damage to ships or aircraft.
In South&nbsp;Korea, which denounced the launch as a "clear breach of U.N. Security Council resolutions", the joint chiefs of staff said the&nbsp;missile&nbsp;had flown about 900 km (560 miles) before splashing into the sea.
North&nbsp;Korea's first&nbsp;missile&nbsp;firing since Jan. 1 came&nbsp;after&nbsp;Pyongyang threatened on Friday an "unprecedentedly persistent, strong" response as South&nbsp;Korea&nbsp;and the United States gear up for annual&nbsp;military&nbsp;exercises as part of efforts to fend off the&nbsp;North's growing nuclear and&nbsp;missile&nbsp;threats.
Following Saturday's launch, South&nbsp;Korea's National Security Council convened a meeting and agreed to increase cooperation on security with Washington and Japan.
Seeking to present a united front with South&nbsp;Korea&nbsp;and Japan, U.S. Secretary of State Antony Blinken described the launch as a "provocative" act in remarks alongside his counterparts from the two countries on Saturday.
"The result of these actions by&nbsp;North&nbsp;Korea&nbsp;is simply to even further solidify the work that we do together, the alliance that we share, and our commitment to the defense of our partners and allies," Blinken said on the sidelines of the Munich Security Conference.
The White House said it was taking necessary measures to protect the U.S. homeland and regional allies, but that the launch did not pose any immediate threat. The Group of Seven foreign ministers condemned the launch and called for a unified response from the international community.
SOLID-FUEL&nbsp;MISSILE&nbsp;PROGRESS?
Nuclear-armed&nbsp;North&nbsp;Korea&nbsp;fired an unprecedented number of&nbsp;missiles last year, including ICBMs that are capable of striking anywhere in the United States, while resuming preparations for its first nuclear test since 2017.
Saturday's&nbsp;missile&nbsp;was launched from the Sunan area near Pyongyang, South&nbsp;Korea's&nbsp;military&nbsp;said. Sunan is the site of the Pyongyang International Airport, where&nbsp;North&nbsp;Korea&nbsp;has conducted most of its recent ICBM tests.
North&nbsp;Korea's ballistic&nbsp;missile&nbsp;and nuclear weapons programmes are banned under U.N. Security Council resolutions, but Pyongyang says its weapons development is necessary to counter "hostile policies" by Washington and its allies.
Allied nuclear&nbsp;drills, called the Deterrence Strategy Committee Tabletop Exercise, are scheduled for Wednesday at the Pentagon and will involve senior defence policymakers from both sides, Seoul's Defence Ministry said.
The two countries are also planning a&nbsp;range&nbsp;of expanded field exercises, including live fire&nbsp;drills, in the coming weeks and months.
Some 28,500 U.S. troops are stationed in South&nbsp;Korea&nbsp;as a legacy of the 1950-1953&nbsp;Korean War, which ended in an armistice rather than a full peace treaty, leaving the parties technically at war.
Pyongyang may have created a&nbsp;military&nbsp;unit tasked with operating new ICBMs, in line with its recent restructuring of the&nbsp;military, state media video footage from a Feb. 9 parade suggested.
That parade displayed more ICBMs than ever before, including a possible new solid-fuel weapon, which could help the&nbsp;North&nbsp;deploy its&nbsp;missiles faster in the event of a war.
"North&nbsp;Korean&nbsp;missile&nbsp;firings are often tests of technologies under development, and it will be notable if Pyongyang claims progress with a&nbsp;long-range&nbsp;solid-fuel&nbsp;missile," said Leif-Eric Easley, a professor of international studies at Ewha University in Seoul.
(Reporting by Hyunsu Yim and Josh SmithAdditional reporting by Steve Holland and Humeyra PamukEditing by William Mallard, Jason Neely, Helen Popper and Diane Craft)

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North Korea fires long-range missile after warning over military drills