US President Barack Obama said Tuesday that North Korea’s “provocative” nuclear test did not make it more secure and called for “swift” and “credible” international action in response.

Obama also vowed in a written statement that Washington would remain vigilant in the face of the underground detonation by the Stalinist state and steadfast in its defense commitments to its allies in Asia.

Obama complained that the test was a “highly provocative act” that — following the North’s December 12 ballistic missile launch — undermined regional stability and violated UN Security Council resolutions.