Washington, Nov 25: The United States may have endangered India's security, and also that of its Far East allies Japan and South Korea, not to speak of jeopardising the lives of its own 100,000 troops in the region, by willfully ignoring nuclear and ballistic missile transactions between North Korea and Pakistan in an effort to secure the latter's cooperation in the war on terrorism. These transgressions occurred as recently as last July when American intelligence agencies tracked a Pakistani cargo aircraft as it landed at a North Korean airfield and took on a secret payload: ballistic missile parts, the chief export of North Korea's military, the New York Times reported in its Sunday editions.