"The situation in Syria is now on a knife edge," Steinmeier said according to a statement tweeted by the Foreign Ministry in Berlin on Thursday.
France's Hollande on Syria tells UN: 'Enough is enough'
"If the ceasefire is to stand any chance (of succeeding), the only path is a temporary, but complete ban of all military aircraft movement in Syria -- for at least three days, better would be seven days," Steinmeier said.
US Secretary of State John Kerry demanded on Wednesday that Russia and the Syrian government immediately halt flights over Syrian battle zones, in what he called a last chance to salvage a collapsing ceasefire.
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