Later this week, officials from the U.S. and Russia will begin talks in Washington on the situation in Aleppo. Meanwhile, Turkish Prime Minister Binali Yildirim is in Moscow for two days of meetings expected to focus first on business. 

Russia and the U.S. are due to begin talks on the withdrawal of rebels from Aleppo later this week in Washington.

According to Russian Foreign Minister Sergey Lavrov, once a deal with the U.S. is reached, rebels who stay behind will be treated as “terrorists.”

Meanwhile, in addition to the medical specialists killed in Aleppo, Russia’s Defense Ministry also announced the loss of a Russian fighter jet Monday, saying it crashed into the Mediterranean Sea while trying to land on the Admiral Kuznetsov aircraft carrier. The pilot, it said, was able to eject and is safe.

Separately, Yildirim is in Moscow for two days of meetings expected to focus first on business. He is to meet with his Russian counterpart Dmitry Medvedev, to discuss further steps on normalization of relations between the two countries.

It is expected that the agenda will include the creation of a free trade zone and the further development of tourism. The Turkish prime minister is also expected to meet Russian President Vladimir Putin on Tuesday. They are likely to discuss the situation in Syria.

Last week, the Kremlin demanded an explanation from Ankara after the Turkish president said he had sent troops into Syria to topple Bashar al-Assad.