Victor Cha was nominated to become Trump's ambassador to South Korea but was dropped after warning the White House against a pre-emptive strike on the North.
The explosion killed at least five people and is believed to have involved a new nuclear-powered cruise missile.
The latest test is sure to increase tensions as Pyongyang and Washington attempt to restart talks on denuclearization and sanctions relief.
Javad Zarif hit out at the U.S., claiming Iran has only built a potent military because America is arming its rivals.
Police in the north of the country arrested three men suspected of trying to sell the French-made missile.
The State Department last week approved a $2.2 billion weapons deal with Taiwan prompting condemnation from Beijing.
Turkey's purchase of the Russian anti-aircraft system has opened up a rift with the U.S., which fears the deal could compromise American military secrets.
Earlier this week the State Department approved a $2.2 billion military package for Taiwan, prompting Chinese condemnation.
The RS-28 Sarmat is reportedly able to carry a nuclear payload capable of destroying an area the size of Texas.
"While these types of firearms are legal and easily obtainable in other countries, they are illegal here in Scotland and across the U.K. Buying them can land you in jail," a top law enforcement chief said.
U.S. military officials have warned that America is lagging behind China and Russia in hypersonic weapons development.
"Russia probably is not adhering to its nuclear-testing moratorium," Lieutenant General Robert Ashley said.
China warned that a "certain major country has withdrawn from one international treaty and mechanism after another while building up its own nuclear and missile power."
"I'll leave that for you to decide," acting Secretary of Defense Patrick Shanahan told Fox News, failing to confirm or deny Russian involvement in North Korea's weapons programs.
"By testing ballistic missiles this month, both the U.S. and North Korea risk blowing up the delicate progress that has been achieved to date through diplomacy," Rick Wayman of the Nuclear Age Peace Foundation said.
President Donald Trump was set to leave the Arms Trade Treaty, but the U.S. has reportedly acted above international law for years in murky weapons sales around the world.
Turkey said its purchase of the S-400 defense system was "a done deal" as China and India also signed purchase agreements. Saudi Arabia and Qatar were among those looking to buy it as well.
The Council of the Licensed Firearms Owners said the Arms Amendment Bill is being rushed through.
Kim Yeon-chul said economic leverage should be used to encourage denuclearization progress.
The defense committee chief of one chamber of Russia's parliament said that Tu-22M3s were sent to Crimea, while another denied it.
Russia's arms control policy director said it was a "thankless task" to figure out what President Donald Trump wanted to discuss, but it seemed that the U.S. "does not really talk about anything."
Sources told Newsweek that the U.S. Army attempted to keep the incident quiet since the soldiers' arrest last November.
"The main goal of this work is to ensure the military security of this country without increasing the current budget expenditures or joining an arms race," Russia's defense minister said.