From left, German Chancellor Angela Merkel, Russian President Vladimir Putin, Turkish President Tayyip Erdogan attend a news conference following the talks with their French counterpart, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Russian President Vladimir Putin, left, and Turkish President Tayyip Erdogan attend a news conference following the talks with their German and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan, left, and French President Emmanuel Macron attend a news conference following the talks with their Russian and German counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan, left, and French President Emmanuel Macron attend a news conference following the talks with their Russian and German counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan, right, and German Chancellor Angela Merkel attend a news conference following their talks with his Russian and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan attends a news conference following the talks with his Russian, German and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan attends a news conference following the talks with his Russian, German and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Turkish President Tayyip Erdogan attends a news conference following the talks with his Russian, German and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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German Chancellor Angela Merkel listens during a news conference following the talks with her Russian, Turkish and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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German Chancellor Angela Merkel speaks during a news conference following the talks with her Russian, Turkish and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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French President Emmanuel Macron speaks during a news conference following talks, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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French President Emmanuel Macron speaks during a news conference following talks, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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From left, German Chancellor Angela Merkel and Russian President Vladimir Putin attend a news conference following the talks with their Turkish and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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French President Emmanuel Macron listens during a news conference following talks, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Russian President Vladimir Putin attends a news conference following the talks with his French, Turkish and German counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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From left, Russian President Vladimir Putin, German Chancellor Angela Merkel, Turkish President Tayyip Erdogan and French President Emmanuel Macron pose for a photo during a news conference following their talks, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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From left, German Chancellor Angela Merkel and Russian President Vladimir Putin attend a news conference following the talks with their Turkish and French counterparts, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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From left, German Chancellor Angela Merkel, Russian President Vladimir Putin, Turkish President Tayyip Erdogan and French President Emmanuel Macron attend a news conference following their talks, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Russian President Vladimir Putin walks upon his arrival at Ataturk International Airport, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Honour guard soldiers stand at attention as Russian President Vladimir Putin, unseen, arrives at Ataturk International Airport, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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German Chancellor Angela Merkel arrives at Ataturk International Airport, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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Russian President Vladimir Putin walks upon his arrival at Ataturk International Airport, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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German Chancellor Angela Merkel arrives at Ataturk International Airport, in Istanbul, Turkey, October 27, 2018. The leaders of Turkey, Russia, France and Germany hold a summit in Istanbul to discuss security, humanitarian and political issues in Syria.

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