External Affairs Minister Sushma Swaraj, in her address at the East Asia Summit Foreign Ministers Meeting here, also underlined the need for finding a diplomatic solution to the situation in Ukraine.
"The senseless loss of lives in the crash of MH17 on July 17 has left the international community with responsibility to ensure safety of civil aviation. Parties in conflict situations must urgently abjure violence and work for diplomatic solutions," Swaraj said.
Malaysia Airlines Boeing 777 with 298 people on board was flying from Amsterdam to Kuala Lumpur when it was downed between Krasni Luch in Luhansk region and Shakhtarsk in the neighbouring region of Donetsk, Ukraine. All 298 people were killed.
It is believed that flight MH17 crashed after being hit by a surface-to-air missile fired from the rebel-held area.
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The Ukrainian government and the pro-Russian separatists fighting for independence in the east of the country have blamed each other for the shooting down of the plane.
In the letter to Najib Razak, Modi had expressed his condolences on the loss of lives on board MH17.
Modi said there is "justifiable outrage across the world and India fully supports efforts for an investigation that can help establish the exact circumstances" in which the incident took place.
Modi had also written to his Netherlands counterpart Mark Rutte condoling the death of Dutch nationals in the tragedy.