In a phone conversation on Sunday, Secretary of State John Kerry

did not accept Lavrov's denial that heavy weapons from Russia were contributing to the conflict and urged him "to stop the flow of heavy weapons and rocket and artillery fire from Russia into Ukraine, and to begin to contribute to deescalating the conflict."

A read of the call described,

"During a phone call this afternoon, Secretary Kerry urged Foreign Minister Lavrov to stop the flow of heavy weapons and rocket and artillery fire from Russia into Ukraine, and to begin to contribute to deescalating the conflict. He did not accept Foreign Minister Lavrov’s denial that heavy weapons from Russia were contributing to the conflict."

Moscow denied any involvement in the region.