However, some experts say North Korea is now mainly focused on the bigger picture of testing its bargaining power against the United States with its new long-range missiles and likely has no interest in letting things get too tense during the drills. And then two more were fired within the next half an hour. Japan has previously deployed missile interceptors after North Korea threatened to fire projectiles over Japan toward the USA territory of Guam.
Since February, Kim Jong Un has test-fired 18 missiles in 12 tests, compared to 24 missiles through all of a year ago.
The U.S. Pacific Command says its assessments indicate that the three missiles failed.
The ban, effective immediately, came as Pyongyang launched three short-range missiles on Saturday according to the U.S. military, reviving tensions days after President Donald Trump said the isolated regime was starting to show Washington some "respect".
"I think it is worth noting that we have had no missile launches or provocative acts on the part of North Korea since the unanimous adoption of the U.N. Security Council resolution", Tillerson said Tuesday, according to a transcript of his briefing.
The launches were the North's first rocket tests since two intercontinental ballistic missile, or ICBM, were fired last month.
Kim Dong-yub, a defense analyst at the Institute for Far Eastern Studies at Kyungnam University in Seoul, said the tests on Saturday appeared to be aimed at expanding the strike range.
Under Mr Kim, Pyongyang has made rapid strides in its ballistic missile technology, which it is banned from pursuing under United Nations resolutions.
These current tests follow a relative calm period in the tensions between US President Donald Trump and the North Korean dictator Kim Jong-un, who threated to attack the US island territory of Guam, a threat which he later retracted.
"In regards to activity in North Korea tonight, the president has been briefed and we are monitoring the situation", she said.
The US Pacific Command said in a statement that three North Korean short-range missiles failed - two after flying an unspecified distance and another seemingly blowing up nearly immediately.
White House press secretary Sarah Sanders said Saturday that Trump was aware of the launches.