Burevestnik Missile Test by Russia
Norway confirmed launch from Novaya Zemlya.
Burevestnik is a second-strike nuclear weapon.
Missile flew 15 hours, 8,700 miles.
System uses reactor heating air to 3,000°F.
2019 test killed five scientists.
Kremlin emphasizes national interests over dialogue.
Experts debate missile's practicality and risks.
1 week ago