The Latest on the conflict in Syria (all times local):

2 p.m.

Germany says Russia and Iran are partly responsible for the suffering of hundreds of thousands of people besieged by Syrian government forces in Aleppo.

German government spokesman Steffen Seibert says the forces of Syrian President Bashar Assad wouldn't be able to continue pounding the city without the help of its foreign allies.

Seibert told reporters in Berlin on Monday that "it's obviously the Russian and Iranian support for the ... Syrian regime which has caused a dramatic worsening of the situation for the population."

He acknowledged that Germany has few options other than to keep raising the issue in public.

Asked whether Germany would consider seeking sanctions against Russia and Iran over their actions in Syria, Seibert said that "all options must remain on the table."

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10:30 a.m.

Turkey's president has called on the United States and other nations to re-assess his country's proposal for the creation of a no-fly zone in northern Syria.

Addressing a NATO parliamentary assembly meeting in Istanbul on Monday, Recep Tayyip Erdogan again criticized allies' reliance on Syrian Kurdish fighters to battle the Islamic State group. Turkey considers the U.S.-backed Syrian Kurdish fighters an extension of outlawed Kurdish militants in Turkey.

Although Turkey has repeatedly called for secure zones to protect Syrians, Washington has been unwilling to wade too deeply into the conflict.

Erdogan said: "I hope that in the upcoming process, this will be reassessed especially by the United States and positive steps will be taken so that terrorism's back is broken and Turkey is rid of the threat of terrorism."