Newsweek:

Russia’s latest nuclear-capable intercontinental ballistic missile—which Russian President Vladimir Putin has claimed can defeat all existing American defenses—will complete its testing phase by the end of 2020, the country’s space agency has announced.

Dmitry Rogozin, the head of Russia’s state space corporation Roscosmos, told reporters Saturday that the RS-28 Sarmat ICBM—known in the West by its NATO code name “Satan 2″—is already undergoing launch tests ahead of its adoption by Russian armed forces.

“Firing tests are already underway,” Rogozin told reporters, according to state news agency Tass. “The bulk of firing tests will be completed by the end of the year. We expect the closing stage of tests at the end of next year.”