Mourners place candles and photographs outside the Alberta Legislature Building in Edmonton, Alberta, Wednesday, Jan. 8, 2020, during a vigil for those killed after a Ukrainian passenger jet crashed, killing at least 63 Canadians, just minutes after taking off from Iran's capital. (Photo: AP)

Ukraine’s leader says Iranian President Hassan Rouhani has assured him of full cooperation in investigating the fatal crash of a Ukrainian airliner near the Iranian capital and that Iran would provide experts access to all data.

President Volodymyr Zelenskiy spoke with Rouhani by telephone on Thursday.

A statement on the Ukrainian presidential website says: “The Iranian party assured full cooperation with a view to holding an objective investigation and finding out the causes of the tragedy. Hassan Rouhani stressed that Iran would provide the Ukrainian expert group with prompt access to all the necessary data.”