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German Chancellor Angela Merkel gestures during a joint news conference with Turkish Prime Minister Ahmet Davutoglu in Ankara, Turkey February 8, 2016. REUTERS/Umit Bektas

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By Tulay Karadeniz and Noah Barkin

ANKARA/BERLIN (Reuters) - German Chancellor Angela Merkel will use a visit to Turkey this weekend to try to soothe tensions over a deal meant to stem the flow of migrants to Europe as questions about its effectiveness and long-term viability mount.

The pact, which came into force almost three weeks ago, aims to help end the chaotic arrival of migrants and refugees on the Greek islands, many fleeing war and poverty in the Middle East and Africa. More than one million reached Europe last year.

The deal initially slowed the numbers of new arrivals to Greece sharply, but boats have been coming again with about 150 people a day, indicating the "hermetic sealing" of the route appears to be over, the International Organization for Migration (IOM) said.

Merkel will pay a one-day visit with European Council President Donald Tusk to Gaziantep near the Syrian border on Saturday, where the two leaders are expected to go to a refugee camp for Syrians and meet Prime Minister Ahmet Davutoglu.

There is much at stake for both sides. Merkel lobbied sceptical European partners to back the deal, under which Turkey agreed to take back migrants who cross the Aegean Sea illegally, and is under political pressure at home to show progress.

Davutoglu sold the deal to the Turkish public partly on the basis that Turks would win quicker visa-free travel to Europe in return, a pledge that now could go unfulfilled, at least by the June deadline he had wanted.

Merkel's also faces criticism at home for allowing a German comedian to be prosecuted for insulting Turkish President Tayyip Erdogan.

"It is both sides that have a strong interest in making this work. Turkey wants support in easing the refugee burden - both financial support and in terms of numbers. And they want visa liberalisation. We have other interests," a Merkel aide said.

"Ultimately it will depend on both sides fulfilling the criteria they need to. If that doesn't happen the deal won't work."

Rights groups have questioned the legality of the deal, which hinges on Turkey being a safe country of asylum. Amnesty International says Turkey has illegally returned Syrians to their war-torn homeland, a charge Ankara denies.

"There is no photo-op that can obscure the deep flaws in the EU-Turkey deal," John Dalhuisen, Amnesty’s Director for Europe and Central Asia, said of Merkel's visit.

Under the deal, Ankara gets more EU funding for refugees living on its soil and the revival of long-stalled EU accession talks, as well as the quicker visa liberalisation, the main prize in the eyes of many Turks.

But European Commission President Jean-Claude Juncker said this week that Turkey must meet all 72 conditions for visa-free travel and the EU would not water down its criteria, rebuffing a warning from Davutoglu that Turkey would no longer need to honour the deal if the promises were not met.

"Merkel is coming tomorrow to soothe both sides," said Elif Ozmenek, a migration expert at the Ankara-based USAK think tank.

COMEDIAN

Erdogan has also put Merkel in a difficult position by demanding that Germany press charges against a comedian who recited a sexually crude satirical poem about him on a German public broadcaster last month.

Merkel's decision to let prosecutors pursue a case against Jan Boehmermann angered many Germans, who saw it as a sop to an authoritarian leader.

"As much as Davutoglu is trying to make this work, Erdogan seems to be going out of his way to test the limits of what he can get away with," a senior German official said.

"He is showing that he can do anything he wants, testing our reactions. That will be very difficult to handle."

A survey released on Friday showed that more than three in five Germans disapproved of Merkel's decision to agree to Turkey's demands over the comedian's case.

The poll was published by ZDF, the channel on which Boehmermann recited a poem suggesting Erdogan indulged in sexual perversions.

Merkel has allowed prosecutors to pursue the case under a section of the German criminal code that prohibits insults against foreign leaders.

The ZDF also poll found that 80 percent of respondents doubted Turkey is a reliable partner in the migrant crisis.

Eight in 10 said Merkel respects Erdogan "too much".

Rights groups and some European politicians had already accused the EU of compromising its principles by striking the deal with Turkey at a time when its record on freedom of expression appears to be deteriorating.

Tusk said on Friday that the EU could discuss money to secure Ankara's help on migration but that the bloc's values, including freedom of expression, were non-negotiable.

"Recent experience with Turkey shows Europe must set clear limits to its concessions," Tusk said in an editorial published by seven European papers.

A senior Turkish government official said the Boehmermann case was likely to be discussed during Merkel's visit but that the main focus would be on relations with the EU and implementing the migrant deal, including how a promised 3 billion euros ($3.4 billion) in funding would be spent.

"We may not be able to say there is total agreement on everything between Turkey and the EU, but it is clear that there is common will. We’re not expecting a troublesome visit," the official said.

(Additional reporting by Orhan Coksun in Ankara, Jan Strupczewski in Brussels, Writing by Nick Tattersall, Editing by Ralph Boulton and Angus MacSwan)

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