Russia and Ukraine have traded accusations over a Russian military plane that crashed near the Ukrainian border. Russia says all 74 people on board died.

The Russian defense ministry said on Wednesday the crash occurred in the western region of Belgorod. It said the aircraft had left a base near Moscow for a prisoner exchange with Ukraine.

Ministry officials say the plane was carrying 65 captured Ukrainian soldiers and nine Russian crew and other personnel. They say Ukrainian forces shot the plane down with two missiles launched from a region near Belgorod.

Russian Foreign Minister Sergey Lavrov called the incident a "terrorist attack" while speaking to reporters at United Nations headquarters in New York on Wednesday.

He said he had requested an emergency meeting of the UN Security Council to discuss the matter.

Ukrainian President Volodymyr Zelenskyy blamed Russia in a video message on Wednesday, saying, "It is obvious that the Russians are messing with the lives of Ukrainian captives, the feelings of their relatives, and the emotions of our society."

Zelenskyy said the country's security agency is investigating the incident, and called for an international investigation as well.