Pedersen wrote in Twitter account that he appreciates "engagement w/interlocutors from Russia, Turkey & Iran."
The Envoy counts on their continued support for the UN political process, the message added.
The 16th round of Astana talks—aimed at stabilizing the war and political crisis in Syria—conclude on Wednesday in Kazakhstan's capital, Nur-Sultan.
The talks started in 2017, by Russia, Turkey and Iran, to provide an international forum for negotiation and consensus-building for the opposing factions in Syria .
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