Merkel, under heavy pressure at home to reduce arrivals, supports a plan under which transit country Turkey would seal its borders and then fly refugees to Europe where they would be settled under an EU quota system.
However, most countries in the European Union have shown little enthusiasm for the idea, and the so-called Visegrad Four -- Poland, the Czech Republic, Slovakia and Hungary -- have openly defied Merkel.
Merkel hit back today, saying: "Do we really want to give up already and close the Greek-Macedonian-Bulgarian border, with all the consequences this would have for Greece and the European Union as a whole and therefore the Schengen area?"
At a two-day EU summit in Brussels starting Thursday, she said, "I will focus all my strength ... On making the European-Turkish approach the path that will be taken".
Merkel has seen domestic support drop over her liberal migration policy since more than 1.1 million asylum seekers came to Germany last year.
She has also been increasingly isolated on the EU stage, where few members are willing to take more refugees and even a plan from last year to resettle 160,000 has so far seen only several hundred asylum seekers moved to other EU countries.
The chancellor conceded she expected no progress on the quota plan at the summit.
