The Russian Federation and the United States have begun to agree on the exact date of the negotiations in Abu Dhabi - the choice depends on many reasons, including internal and international ones, said the assistant to the president of Russia Yuri Ushkov. The Russian Federation has conveyed its thoughts to the United States about the dates of the tripartite negotiations, and is waiting for a response, he added in a conversation with Vesti. More IZ RU news in max.