German Chancellor Angela Merkel arrives for a plenary meeting of the United Nations Sustainable Development Summit 2015 at United Nations headquarters in Manhattan, New York, September 25, 2015.

Chancellor Angela Merkel’s chief of staff has rejected a suggestion by her economy minister that Germany should support a lifting of sanctions against Russia in order to win Moscow’s cooperation to help end the civil war in Syria.

Chief of staff Peter Altmaier acknowledged that Russia, which is subject to U.S. and European Union sanctions because of its annexation of Crimea and backing for Ukrainian separatist rebels, has an important role to play in Syria.

“But this doesn’t mean that we will change our stance on the Ukraine crisis. We won’t let ourselves be blackmailed,” Altmaier told Der Tagesspiegel newspaper in an interview published on Sunday.

Russia has been carrying out a military buildup in Syria to support President Bashar al-Assad, its longstanding ally.

German Economy Minister Sigmar Gabriel, who heads the Social Democrats, Merkel’s coalition partner, said on Friday western countries should reconsider their position on Russia.

“Everyone should be smart enough to know that you can’t stick to sanctions permanently on the one hand and ask for cooperation on the other hand,” Gabriel said.

Foreign Minister Frank-Walter Steinmeier, another leading member of the Social Democrats, told ARD television sanctions against Russia could only be rolled back if there was progress in the peace process in eastern Ukraine.

“I hope that cooperation (with Russia) in the matter of Syria can help us to move forward in the Ukraine,” he said, adding that both conflicts should be treated separately.

“We don’t want to mix things up”, Steinmeier said.

The expected influx of more than 800,000 asylum-seekers to Germany this year, including a large number of Syrian refugees, has fuelled debate among German politicians on how to end the four-year-old civil war.

The EU and Germany have so far insisted that sanctions against Russia can only be lifted after an agreed peace plan for Ukraine, which Merkel helped to broker, has been fully implemented.

A German government spokesman said last week plans by pro-Russian separatists to hold local elections in eastern Ukraine were a serious violation of the peace deal and it was regrettable that Moscow has not distanced itself from the idea.

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