Is there any news article about the emergency purchase of THAAD by India? Also, why will america agree to it.. as we are going ahead with S-400 deal...Yes entirely and not only that, Chinese operate S-400 also. They know everything about this system. THAAD is something which neither chinese nor Russians have a clue about and that is the reason for emergency purchase of it. US can sell stuff on emergency basis to its major allies without the permission of Senate and take the approval later citing operational requirements. AND they do not need to position their own operators if the agreement for protection of IPR is signed between two nations. India signed it an year back if my memory serves me right.