Pyongyang has conducted seven rounds of short-range missile tests since July with denuclearization talks with the U.S. in limbo.
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.
Gorbachev was the Soviet leader when the agreement—limiting nuclear capable missiles in Europe—was signed in 1987.
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.
U.S. military officials have warned that America is lagging behind China and Russia in hypersonic weapons development.
Yi-Chi Shih sourced sensitive microchips from an American company whose customers include the U.S. Air Force and DARPA.
"No water came out of the showers, faucets were missing and lights were not set up properly," Kim complained of facilities at a youth center.
"If he's working towards a deal, as you say, it's a deal we don't know about," John Brennan said. "He basically said he wants denuclearization. That is not going to happen."
Washington's demand that Turkey kill a deal for Russia's S-400 anti-aircraft system was "unacceptable," a Kremlin spokesman said.
Not everyone was so sure that the supposed threat from Iran warrants America's military response.
"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.
"We all know perfectly well that so far there are no such weapons in the world, no one else, except us, except Russia," Russian President Vladimir Putin said.
North Korean supreme leader Kim Jong Un said, "Genuine peace and security of the country are guaranteed only by the strong physical force capable of defending its sovereignty."
The U.S. may seek to fight fire with fire when it comes to Russia's and China's hypersonic weapons.
Russian Ambassador to Washington Anatoly Antonov warned that Russia would "be forced" to deploy missiles capable of targeting all of Europe if the U.S. were to place new missiles on the territory of its European allies.
The drills were designed "to protect the territorial waters of our country, maintain lines of communication and promote the flag of the Islamic Republic of Iran."
President Donald Trump said the U.S. "will work with NATO and our other allies and partners to deny Russia any military advantage from its unlawful conduct."
Saudi Arabia may be building its first missiles at home as the U.S. and Israel step up their campaign to isolate mutual foe Iran.
A high-level North Korean official is meeting with Secretary of State Mike Pompeo on Friday.
New satellite images show Iskander ballistic missile units conducting drills within range of the border.
"The development of the shield must closely follow the development of spears," award-winning Chinese defense engineer Qian Qihu said.
From missiles capable of "delivering cargo to any part of the world" to female soldiers who "will blow your head away," the Russian military is setting up an exciting 2019.
Russia has again reportedly tested the 3M22 Tsirkon anti-ship hypersonic cruise missile, which flew at eight times the speed of sound.
Iran's envoy to the U.N. accused the U.S. secretary of state of "fabrication, disinformation and evoking irrelevant criteria."
From fighter jets to cyber security—how do the Middle Eastern giants compare?
Russia's new stealth jet is reportedly set to be equipped with hypersonic missiles said to be invincible to all current defense systems.
The Syrian Defense Ministry said, "Our air defenses are thwarting hostile targets over the area of Al-Kiswah and are shooting them down."