The US National Nuclear Security Administration (NNSA) has announced the successful flight test of B61-12 gravity nuclear bombs in Nevada. It comes as US lawmakers reportedly push for a withdrawal from a landmark nuclear treaty with Russia.

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The second qualification flight test for the nuclear weapon was carried out by the NNSA and the US Air Force, with the first one having been successfully conducted in March.

The first test drew criticism, including from Brian Becker, director of the anti-war ANSWER coalition, who told RT: "In order to placate his critics, in the media and in politics, Trump has given a blank check to his generals. So they are having a grand time right now, and they are testing all the weapons they've been wanting to test, but not been able to."

B61-12 gravity bombs, without a nuclear warhead, were dropped from F-15E fighter jets at Tonopah Test Range in Nevada on August 8. The tests were intended to check the bomb's "non-nuclear functions and the aircraft's capability to deliver the weapon," according to an NNSA statement.