An international team of investigators said on Wednesday it found “strong indications” that Russian President Vladimir Putin approved the supply of heavy anti-aircraft weapons to Ukrainian separatists who shot down Malaysia Airlines flight MH17 in 2014 with a Russian missile.

However, members of the Joint Investigation Team said they had insufficient evidence to prosecute Putin or any other suspects and they suspended their inquiry into the shooting down that killed all 298 people on board the Boeing 777 flying from Amsterdam to Kuala Lumpur.

Russia has always denied any involvement in the downing of the flight over eastern Ukraine on July 17, 2014, and refused to cooperate with the international investigation.

Dutch prosecutors said that “there are strong indications that the Russian President decided on supplying” a Buk missile system — the weapon that downed MH17 — to Ukrainian separatists.

“Although we speak of strong indications, the high bar of complete and conclusive evidence is not reached,” Dutch prosecutor Digna van Boetzelaer said, adding that without Russian cooperation, “the investigation has now reached its limit.”

The team played a recording of an intercepted phone call in which they said Putin could be heard discussing the conflict in eastern Ukraine.