Also see Russian nuclear engineers buried after 'Skyfall nuclear' blast | Al Jazeera
"President Vladimir Putin “has repeatedly said that Russian developments in this area surpass the level achieved by other countries, and are quite unique,” Kremlin spokesman Dmitry Peskov told reporters Tuesday on a conference call, in response to a question on Trump’s tweet. U.S. officials have said repeatedly in the past year that its military is working on such programs, so Trump’s statement offers no new information, he said.Putin’s Missile Is Far Better Than Trump’s Missile, Kremlin Says | Bloomberg
An Aug. 8 blast in Russia’s Arkhangelsk region killed five atomic scientists during the test of a missile engine that used “isotope power sources” on an offshore platform in the White Sea. Trump later tweeted that the U.S. “is learning much from the failed missile explosion in Russia” and added that “we have similar, though more advanced, technology,” without giving more details."