North Korea fired a ballistic missile into the sea off its east coast early on Sunday, the first such test since Trump was elected.

US President Donald Trump said late on Saturday that the United States stands fully behind Japan in the aftermath of North Korea’s latest missile launch.

“I just want everybody to understand, and fully know, that the United States of America is behind Japan, our great ally, 100 percent,” Trump told reporters during a joint statement with Japan’s Prime Minister Shinzo Abe.

North Korea fired a ballistic missile into the sea off its east coast early on Sunday, the first such test since Trump was elected, and his administration indicated that Washington would have a calibrated response to avoid escalating tensions.

The test was of a medium- or intermediate-range missile that landed in the Sea of Japan, according to the US defense department, not an Intercontinental Ballistic Missile (ICBM), which the North has said it could test at any time.

The launch marks the first test of Trump’s vow to get tough on a North Korean regime that last year tested nuclear devices and ballistic missiles at an unprecedented rate in violation of United Nations resolutions.

A US official said the Trump administration had been expecting a North Korean “provocation” soon after taking office and will consider a full range of options in a response, but these would be calibrated to show US resolve while avoiding escalation.

The new administration is also likely to step up pressure on China to rein in North Korea, reflecting Trump’s previously stated view that Beijing has not done enough on this front, the official said, speaking on condition of anonymity.

“This was no surprise,” the official said. “The North Korean leader likes to draw attention at times like this.”

The latest test comes a day after Trump held a summit meeting with Japanese Prime Minister Shinzo Abe and said he agreed to work to ensure a strong defense against North Korea’s threat, and also follows Trump’s phone call last week with Chinese President Xi Jinping.

Abe called the launch “absolutely intolerable” and said North Korea must comply with U.N. Security Council resolutions.

China is North Korea’s main ally but has been frustrated by Pyongyang’s repeated provocations, although it bristles at pressure from Washington and Seoul to curb the North and its young leader, Kim Jong Un.

China’s foreign ministry did not immediately respond to a request for comment on Sunday morning.

Trump and his aides are likely to weigh a series of possible responses, including new US sanctions to tighten financial controls, an increase in US naval and air assets in and around the Korean peninsula and accelerated installation of new missile defense systems in South Korea, the administration official said.

But the official said that given that the missile was believed not to have been a threatened intercontinental missile and that Pyongyang had not carried out a new nuclear explosion, any response will seek to avoid ratcheting up tensions.

Show of force

The missile was launched from an area called Panghyon in North Korea’s western region just before 8 a.m. (2300 GMT Saturday) and flew about 500 km (300 miles), the South’s Office of the Joint Chiefs of Staff said.

“Our assessment is that it is part of a show of force in response to the new US administration’s hardline position against the North,” the office said in a statement.

The South’s military said Seoul and Washington were analyzing the details of the launch. Yonhap News Agency said the South Korean military was assessing the launch to confirm whether it was a Musudan intermediate-range ballistic missile, which has a designed range of 3,000 km (1,800 miles).

US President Donald Trump (R) with Japanese PM Shinzo Abe in the White House this week.