"We are with you all the way, and we will not waver", he was quoted as saying.
Such developments have escalated global fears, and the US and South Korea have been pushing governments around the world to take unilateral action, including discouraging countries from using North Korean workers and ending visa waivers for North Koreans.
Hwang also expressed hopes for expanding its alliance with the United States under the Trump administration.
Australia's prime minister says he spoke with Donald Trump over the telephone and the US president-elect agrees on the importance of the USA military alliance with Australia and the importance of the US military presence to the security of the Asia-Pacific region.
Trump had said during the election campaign he would be willing to withdraw usa military stationed in South Korea unless Seoul paid a greater share of the cost of the deployment. -South Korea pressure on North Korea, so "the next USA administration without hesitation" continues current policy.
He has consistently emphasized a will to consider withdrawing US troops from the region.
NORTH Korean tyrant Kim Jong-Un is planning ANOTHER nuclear missile test - on the day of the United States presidential election. She also reminded him that the North has a history of carrying out provocations during the transition period between USA administrations.
President Barack Obama said in 2008 he would scrap Nafta (North American Free Trade Agreement) and President Jimmy Carter said he would withdraw US troops from Korea [in the late 1970s]. In response, Trump said he agreed with her "100 percent", according to a transcript provided by the Blue House, as the president's office is known.
Trump has said South Korea should be paying more for its defense and said he might withdraw American troops if it doesn't.
A Downing Street spokesman said Trump set out his "close and personal connections with, and warmth for, the United Kingdom", while Mrs May stressed the importance of Britain's relationship with the USA in the wake of the Brexit vote.
Trump also held phone conversations with the leaders of Mexico, Turkey and India.
Yonhap also reported that South Korean Air Force Chief of Staff Jeong Kyeong-doo flew near the border with North Korea in an RF-16 reconnaissance jet.