The launches coincide with joint exercises between the US and South Korean militaries, exercises that North Korea always strongly protests because it considers them preparation for an invasion.
Reuters report says that the USA military's Pacific Command said it had detected three short-range ballistic missiles, fired over a 20 minute period.
But Chinese diplomats and the state news media have asserted that the USA and its allies should not depend so much on China to ease tensions created by North Korea's growing nuclear weapons programme and missile capabilities.
Amid recent tension on threat to mount ballistic missile attack at Guam, the USA territory in Western Pacific, North Korea has fired several short range missiles in the sea off its east coast on Saturday. "I respect the fact that he is starting to respect us", he said of Mr Kim.
South Korea's Joint Chiefs of Staff estimated the missiles had traveled over 150 miles before plunging into the Sea of Japan.
These tests took place in full military maneuvers joint between us forces and south Korean.More news: German killer nurse murdered 'at least 90 patients'
U.S. Army soldiers prepare their military exercise in Paju, South Korea, near the border with North Korea, Saturday, Aug. 26, 2017.
This is the latest development in escalating tensions between North Korea and the U.S., which have been simmering for months.
The country has fired 18 missiles during 12 tests since February, further perfecting its technology with each launch.
Pyongyang has recently faced a wave of worldwide sanctions over its test-firing of two intercontinental ballistic missiles (ICBM) last month that apparently brought most of the United States into range for the first time.
A war of words then broke out between Trump and North Korea as negotiators worked behind the scenes to calm the conflict. The officials say the North has developed the multiple-tube launchers because they are cheaper than short-range, Scud-type ballistic missiles and because they enable more projectiles to be fired. North Korea is reluctant to give up its weapons programs necessary to counter alleged United States hostility.
The latest round of sanctions came just as US Secretary of State Rex Tillerson welcomed North Korea's recent restraint in the wake of the UN Security Council resolution. The division occurred at the end of World War II in 1945. In 2002, US President George Bush described North Korea as the member of an "Axis of Evil" along with Saddam Hussein's Iraq and revolutionary Iran.