The U.S. officially asked the U.N. Security Council to vote on a draft sanctions resolution Monday.
"I can say for sure that there will be no war on the Korean Peninsula again", Mr Moon said at a question-and-answer session, reiterating his earlier pledge not to allow South Korean ally USA to launch an attack on the North.
The recent survey found that 58 per cent of respondents felt there was no possibility North Korea would cause a war, while 37 per cent thought it would.
The clashes came as South Korean President Moon Jae-in and Japanese Prime Minster Shinzo Abe met in eastern Russian Federation and repeated their calls for stronger punishment of North Korea over its nuclear ambitions, including denying the country oil supplies.
He added: "Keep in mind the entire flight time from North Korea to the United States is well under any hour [and] the authority is given in advance".
U.S. Secretary of State, Rex Tillerson, said on Thursday that if North Korea wants a response after a nuclear attack, "there will be one". "If we do use it on North Korea, it will be a very sad day for North Korea". "I would prefer not going the route of the military, but it's something certainly that could happen", Trump said at a press conference Thursday.
The threat "provoked the President", a source close to Trump's security team told Newsmax. Seongju residents and activists have anxious over rumoured health hazards and the possibility of being targeted in North Korean attacks.
Six police officers and 32 other people were injured, none seriously, in the clashes, said a fire department official in Seongju.
Moreover, the shorter the space between each test, the less there is that North Korea's scientists and technicians can learn from them and make improvements to their designs, he said.
Moon, who was elected in May after a corruption scandal engulfed his predecessor, Park Guen-hye, bringing about her impeachment, still enjoys great popularity among South Koreans.
The United States wants the Security Council to impose an oil embargo on North Korea, ban its exports of textiles and the hiring of North Korean laborers overseas, and to subject Kim Jong Un to an asset freeze and travel ban, according to a draft resolution seen by Reuters on Wednesday.