There are few details about the latest missile test, but North Korea has often used foreign-trained scientists and foreign-sourced materials.
South Korea launched a "precision strike" missile exercise after North Korea conducted its first missile test in more than two months.
China does not believe in the arms race, a military analyst said.
The missiles flew almost the full length of Russia, hitting targets both in the far-east and northwest, as Russian warplanes practiced fire on ground targets nearby.
The monster-themed ballistic missile is part of a three-tier attack plan designed to inflict "unbearable cost" to North Korea's military and government.
The video released by the Iranian government was more than seven months old.
The RS-24 Yars flew more than 3,000 miles starting in western Russia and according to the country's Ministry of Defense, confirmed its "reliability."
After North Korea's successful test this week, the answer isn't particularly reassuring.
The rogue state has been working hard to develop a nuclear-tipped missile capable of striking the U.S. mainland.
The U.S. military started moving parts of the THAAD missile system to a deployment site in South Korea on Wednesday.
If the U.S. can't sustain its monopoly on the development of precision missile systems, it will be increasingly vulnerable in the western Pacific.
The move is possible retaliation for U.S.-South Korean drills that began last week.
Kim Jong Un had warned that the nation was close to test-launching a ballistic missile.
Mattis' remarks come amid concern that North Korea could be readying to test a new ballistic missile, in what could be an early challenge for Trump's administration.
The United States is expected to impose sanctions on multiple Iranian entities as early as Friday following Tehran's recent ballistic missile test.
Iran's defense minister said the test did not breach the Islamic Republic's nuclear agreement with world powers or a U.N. Security Council resolution endorsing the pact.
Russia's strategic missile troops will conduct 150 drills in 2017.
U.N. Security Council to meet Tuesday to discuss the three ballistic missiles that hit Japan's air defense identification zone.
North Korea's attempt to launch a ballistic missile comes two days after issuing threats over Washington's blacklisting of Kim Jong Un for human rights abuses.
It is believed the weapon may have been a Musudan missile, which can reach Japan.
Pyongyang wants the U.S. to halt its military exercises with South Korea in return.
South Korea, experts fear the North may conduct its fifth nuclear test 'at any time.'
North Korea failed to launch a ballistic missile off the country's east coast.
British businessmen also blacklisted for supporting Iranian airline.