Last week, just before his meeting with China's Xi Jinping, US President Donald Trump stirred a hornet's nest by saying the US would resume nuclear weapons testing . Five days later, Russian President Vladimir Putin asked his security council to prepare for nuclear tests. The developments have raised concerns of a destabilising nuclear arms race.

Trump has justified his move by claiming that Russia, China and Pakistan were testing nuclear weapons . US energy secretary Chris Wright, however, clarified that the President didn't mean full-scale nuclear tests. But Trump's statement travelled around the world, particularly in Beijing, Moscow and Pyongyang.

If the US does indeed test weapons, it will trigger a global chain reaction. Russia and China could follow the US and begin their

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