WASHINGTON (AP) — For a second time, North Korea has canceled its invitation for a senior U.S. envoy to visit the country to discuss the possible release of American Kenneth Bae (bay), who's been held for more than a year.

The cancellation is an apparent protest of upcoming annual military drills between the U.S. and South Korea.

North Korea also claims that U.S. nuclear-capable B-52 bombers staged drills near the Korean Peninsula, which it calls a rehearsal for invasion.