President Obama on Saturday urged Russian President Vladimir Putin to end Moscow’s air siege in Syria against opposition forces, the White House said on Sunday.

“In particular, President Obama emphasized the importance now of Russia playing a constructive role by ceasing its air campaign against moderate opposition forces in Syria,” the administration said in a readout of the call.

“The leaders agreed that the United States and Russia will remain in communication on the important work of the [International Syria Support Group (ISSG)],” it added.

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Obama also called on the combined Russian-separatist forces to honor the Feb. 12, 2015, Minsk agreement and adhere to a ceasefire in Ukraine.

“The President reiterated the importance of quickly reaching agreement on the modalities for elections in eastern Ukraine that comply with [Organized Security and Cooperation in Europe] standards,” the statement said.

The Kremlin termed the conversation as “frank and constructive,” according to RT.