Secretary of the National Security and Defense Council (NSDC) of Ukraine Oleksiy Danilov and Secretary of the Supreme National Security Council of Iran Ali Shamkhani in Tehran on Monday have discussed the investigation into the downing of the Boeing-737-800 aircraft flight PS752 operated by Ukraine International Airlines.

Shamkhani expressed condolences to the families of the victims and stressed Iran's full readiness to cooperate in the probe, the NSDC's press service reported.

In his turn, the NSDC secretary expressed his gratitude to the Iranian side for facilitating the work of the group of Ukrainian experts at the crash site.

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Danilov said Ukraine insisted on a comprehensive and thorough investigation of all the circumstances of the incident, ensuring compliance with international legal norms.

Danilov put particular emphasis on the urgent need to study the "black boxes," underscoring Ukraine's technical and scientific capabilities to this end.

Read alsoPS752 downing: Ukraine releases intercepted tower communications proving Iran was aware of missile launch all along

The sides agreed on the need to avoid politicization of the technical investigation and intensify cooperation of experts and specialists.

Ambassador Extraordinary and Plenipotentiary of Ukraine to the Islamic Republic of Iran Serhiy Burdyliak, First Deputy Director of the National Bureau for Investigation of Aircraft Events and Incidents with Civil Aircraft Ihor Misharin also participated in the negotiations.

As UNIAN reported earlier, Kyiv-bound UIA flight PS752 crashed shortly after takeoff from Tehran's Imam Khomeini International Airport in the early hours of January 8. It was carrying 167 passengers and nine crew members on board. Two passengers and the crew members were Ukrainians. There were also 82 citizens of Iran, 63 citizens of Canada, 10 citizens of Sweden, four citizens of Afghanistan, three citizens of Germany and the United Kingdom each. There were no survivors.

On January 11, Iranian President Hassan Rouhani officially admitted that the Ukrainian airliner had been shot down by accident as a result of a "human error" and that those responsible would be held accountable.

Read alsoIran not to hand over black boxes from UIA's downed plane to outside governments

On February 2, intercepted communications between Tehran Airport's air traffic control tower and the second pilot of Iran's Aseman Airlines flight at the time of the crash of flight PS752 were released by TSN.Tyzhden. Tehran blamed the Ukrainian authorities for leaking what it described as confidential evidence, and said it would no longer share investigation materials with Ukraine.

Tehran has not yet handed over the PS752 black boxes to Kyiv, although the Iranian authorities do not have equipment to analyze them.