In this file photo, Union Defence Minister Manohar Parrikar with his Vietnamese counterpart Gen Ngo Xuan Lich during the latter's ceremonial welcome at South Block, in New Delhi.

In this file photo, Union Defence minister Manohar Parrikar escorted by Pentagon Officials as he arrives at New Yorks John F Kennedy Airport , enroute to Washington DC.

In this file photo, Defense Minister Manohar Parrikar and Chief of Army staff, General Dalbir Singh at the Army Technology Seminar on Common Technologies and Advanced Materials For...

A South Korean army soldier mans a K-9 self-propelled howitzer during a military exercise in Paju, South Korea, near the border with North Korea.

Defence Minister Nirmala Sitharaman addresses after unveiling the 'Pradhan Mantri Shram Yogi Pension Yojana' at a function in Chennai.

In this handout photo released by the Indian Ministry of Defence, Indian Defence Minister Nirmala Sitharaman, left, meets with Wing Commander Abhinandan Varthaman at a hospital in ...

(L to R) Air Vice Marshal RGK Kapoor, Maj Gen Surinder Singh Mahal and Rear Admiral Dalbir Singh Gujral at a military press conference at South Block in New Delhi.

Air Force Air Vice Marshal R.G.K. Kapoor addresses the media on the recovery of a part of an air-to-air AMRAAM missile which was allegedly fired by Pakistani Air Force aircraft vio...

Defense officials display a part of an air-to-air AMRAAM missile which was allegedly fired by Pakistani Air Force aircraft violating Indian airspace, in New Delhi.

Defense officials display a part of an air-to-air AMRAAM missile which was allegedly fired by Pakistani Air Force aircraft violating Indian airspace, in New Delhi. Indian Air Vice ...

A test-pilot drives a military buggy in Gudermes, 30 kilometers (19 miles) east of Chechen regional capital Grozny, southern Russia. The provincial leader, Ramzan Kadyrov, presente...

Union Defence Minister Nirmala Sitharaman addresses on 'India's National Security and importance of Rafale Deal', in Ahmedabad.

Defence Minister Nirmala Sitharaman addresses at the launch of 'Indigenous 3DR Stereotactic System', in Bengaluru.

In this file photo, Defense Minister George Fernandes on his way to appear before the Venkataswami Commission in New Delhi. Fernandes is allegedly involved in a Defense procurement...

In this file photo, Defense Minister George Fernandes, presides over the Naval Senior Officers conference as Naval Chief, Admiral Sushil Kumar, looks on in New Delhi.

President Donald Trump speaks about American missile defense doctrine, at the Pentagon.

Union Defence Minister Nirmala Sitharaman with Air Chief Marshal BS Dhanoa during her visit to Chabua Airbase in Dibrugarh, Assam, Thursday, April 19, 2018.

Union Defence Minister Nirmala Sitharaman shakes hands with Royal Thai Navy Commander-in-Chief Adm Luechai Ruddit during a call-on as Chief of Naval Staff Admiral Sunil Lanba looks...

Defense Minister Nirmala Sitharaman poses with her Russian counterpart Sergei Shoigu, left, outside the defense ministry before their meeting in New Delhi.

Defence Minister Nirmala Sitharaman speaks during the Indian Defence Conclave, in New Delhi.