Refusing to elaborate on U.S. military options because "we shouldn't be announcing all our moves", Mr Trump added: "It is a chess game".
"North Korea disrespected the wishes of China & its highly respected President when it launched, though unsuccessfully, a missile today".
North Korea has kept the West on edge for weeks over signs it may conduct a sixth nuclear test, punctuated by a series of missile tests that have aroused U.S. fears that the regime may be close to developing a ballistic missile capable of hitting the United States mainland with a nuclear warhead.
Trump has said he is counting on Chinese President Xi Jinping to encourage North Korea to give up its pursuit of ballistic missile and nuclear weapons programs.
But, the President would not discuss the possibility of military action - saying "I don't know.we'll see" when asked if another missile launch by North Korea would mean retaliation.
"It depends on the actions of North Korea".
Japan's navy has dispatched its largest destroyer to escort a U.S. military ship off the Japanese coast amid heightened tension on the Korean Peninsula.
In Australia, Prime Minister Malcom Turnbull used a commemoration of a World War II naval battle to warn North Korea against military threat.
The timing of the launch suggested a complex North Korean message to the world, said Kim Dong-yub, an expert at Kyungnam University's Institute of Far Eastern Studies in Seoul.
82 freed Chibok girls arrive in Abuja
Neither the Nigerian president nor Boko Haram, which has links to the Islamic State extremist group, gave details on the exchange. The girls were released near the town of Banki in Borno state near Cameroon and will be transported to the capital, Abuja .
But as tensions fuel between the United States and North Korea over its nuclear weapons programme, Mr Trump said he "no idea" if Mr Kim was sane.
New joint drills with the USS Carl Vinson and the Korean navy began Saturday in waters off the Korean Peninsula, a South Korean military spokesman said.
But the prospects for any more US money going there appeared bleak.
For its own part, North Korea too has signaled that it remains open to negotiations.
A flurry of statements issued through the country's official media following the dispatch of the U.S. Navy battle group and the two military strikes in April have maintained a bellicose tone. "And it also means being prepared for military operations if necessary", he added.
The South Korean politician expected to win a May 9 presidential election, Moon Jae-in, called the test an "exercise in futility".
The committee is headed by Ri Su Yong, a vice chairman of the Workers' Party of Korea, who is the top official in charge of overseeing foreign affairs.
His ideas included a ban on North Korean coal imports and preventing its overseas guest laborers, a critical source of government revenue, from sending money home.
But asked about the possibility of a United States strike, he would not be drawn saying it was a "chess game" which he hoped could be resolved without military action. And we also know that the USA has few defenses in place when it comes to preventing North Korea from launching a nuclear strike, or stopping one that has already begun.
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