The United States and South Korea on Monday warned that a nuclear test by North Korea would be met with a “unified and firm response.” “Any North Korean provocations, including a nuclear test, will be met with a united and firm response from our alliance and the international community,” South Korean Foreign Minister Park Jin told reporters in Washington following a meeting with US Secretary of State Antony Blinken. Washington and Seoul have been warning that Pyongyang could carry out its first nuclear test since 2017 at any time, an assessment shared by the International Atomic Energy Agency …