President Trump’s threat on Wednesday to restart the testing of nuclear weapons has raised numerous knotty questions about national and global security.

Pakistan and China are among the countries which are testing nuclear weapons, U.S. President Donald Trump has said to justify his administration’s plans to resume testing of the U.S.’s own nuclear ass...

Trump suggested that several countries, including Russia, China, North Korea, and Pakistan, are carrying out nuclear tests, while the US is not.