US President-elect Donald Trump recently dropped a bombshell when he suggested in a tweet that America must greatly expand its nuclear capability until when the world comes to its senses. The tweet came less than 24 hours after Trump’s meeting with a dozen Pentagon officials to discuss of the US nuclear arsenal. The move was also seen as a kind of reaction to remarks by President Vladimir Putin who suggested Russia should reinforce its nuclear arsenal. To shed more light on the latest controversy, we have spoken to two experts.