President Biden said Wednesday that the US military is willing to fight nuclear-armed China on behalf of the Philippines after ships from the two Asian countries collided near a disputed, unpopulated island in the South China Sea. “The United States defense agreement with the Philippines is ironclad. Any attack on the Filipino aircraft, vessels or armed forces will invoke our mutual defense treaty with the Philippines,” Biden said during a joint press conference at the White House alongside Australian Prime Minister Anthony Albanese. On Sunday, two of Manila’s military ships collided with a Chinese vessel that sought to block them...