Russian President Vladimir Putin has ratified Moscow’s withdrawal from an international treaty banning nuclear weapons testing. Moscow cited the lack of US ratification of the treaty as the reason for its withdrawal. The measure passed both houses of parliament last month. Despite not having ratified the treaty, Washington has in practice complied with the test ban since the 1990s. Putin has said Russia’s withdrawal from the treaty would “mirror” the US position. In addition to the US, the treaty has not been ratified by China, India, Pakistan, North Korea, Israel, Iran and Egypt. Putin has claimed that some experts argue for the necessity of conducting nuclear tests but said that he had not formed an opinion on the issue. What is your take on the ban ?