Relations between NATO allies the U.S. and Turkey have been strained by Ankara's decision to purchase the Russian-made S-400 anti-aircraft system.
The explosion killed at least five people and is believed to have involved a new nuclear-powered cruise missile.
The Russian president said that Moscow would respond with "comprehensive measures" after the Pentagon test-fired a non-nuclear cruise missile.
Stories have been emerging from medical workers who treated victims of radiation following the blast on a platform in Noyonoksa, northern Russia.
Two short-range ballistic missiles were launched on Wednesday in North Korea's second such test in less than a week.
The latest test is sure to increase tensions as Pyongyang and Washington attempt to restart talks on denuclearization and sanctions relief.
The RS-28 Sarmat is reportedly able to carry a nuclear payload capable of destroying an area the size of Texas.
A Pentagon spokesperson said China's actions are "contrary to its claim to want to bring peace to the region."
National security adviser John Bolton, Japanese Prime Minister Abe Shinzo and now the State Department have all contradicted the president.
China warned that a "certain major country has withdrawn from one international treaty and mechanism after another while building up its own nuclear and missile power."
Senator Chris Murphy said "dumb wars start when each party mistakenly believes that the other party's defensive or reactive actions are actually offensive and proactive."
"I'm not a military man, but what I can tell you is that we do not fire missiles out of small boats," said Iran's U.N. ambassador Majid Takht Ravanchi.
The modified Hellfire missile has reportedly been used in Libya, Syria, Iraq, Yemen and Somalia.
The North Korean leader also reportedly commanded troops to be at "high alert posture" and to prepare to "defend the political sovereignty and economic self-sustenance of the country."
Russia had been closely watching recent reports that the White House was studying a comprehensive deal that would include China, but Moscow was also hoping for a promise to never use nuclear weapons.
The West's way of doing things is "losing its attractiveness and is no more viewed as a perfect model for all," Russian Foreign Minister Sergey Lavrov said.
So-called "loitering munitions" can wait for a target to emerge for hours at a time.
Iranian National Security Council head Ali Skamkhani warned his country would "respond decisively and proportionately as a lesson for the Israeli liar and criminal rulers."
The Dongfeng-26 missile has been dubbed the "Guam killer."
Both U.S. and Polish officials have argued that the conference would not target Iran, despite Secretary of State Mike Pompeo's statement that "there will be a focus on Iran."
Russia defended its new 9M729 cruise missile, claiming it fell short of the range restricted by the 1987 Intermediate-range Nuclear Forces treaty that the U.S. is threatening to leave.
Meanwhile, a family in Texas was threatened with baby kidnapping after their Nest was hacked.
Trump and Secretary of State Mike Pompeo met Friday with Kim Yong Chol, vice chairman for the central committee of the ruling Korean Workers' Party.
"China is expressing its extreme discontent and strong objection" to President Donald Trump's 2019 Missile Defense Review.
The 3M-54 Kalibr cruise missile is already capable of delivering a blow more than 1,200 miles away, and the new and improved version may reach the western Atlantic.
Despite President Donald Trump's initial vows to rebuild broken ties between Russia and the U.S., the world's two leading military powers have been at major odds.