Turkish Foreign Affairs Minister Mevlüt Çavuşoğlu gives a joint press conference after a meeting with his German counterpart at the Turkish Foreign Ministry in Ankara, Turkey on October 26 | Adem Altan/AFP via Getty Images Turkish minister: Germany’s Syria proposal ‘unrealistic’ Annegret Kramp-Karrenbauer’s plan has run into resistance both at home and amid NATO members.

German Defense Minister Annegret Kramp-Karrenbauer's plan to establish an international security zone in northern Syria is "unrealistic," Turkey's foreign minister said.

Speaking at a joint press conference with his German counterpart Heiko Maas on Saturday, Mevlüt Çavuşoğlu said Turkey would not tolerate any human rights violations in northeast Syria, Reuters reported.

"We will investigate to the very end" even the "least violation of human rights,” Çavuşoğlu said.

In early October, the United States ordered the withdrawal of troops from parts of northeastern Syria — allowing Turkey to mount a military incursion against Syrian Kurdish fighters who had been Washington's allies in the fight against the Islamic State. Turkey's offensive sparked condemnation from many other NATO members and the European Union.

Kramp-Karrenbauer proposed the establishment of an international security zone in northern Syria, but the plan ran into resistance both at home and among her NATO colleagues at a meeting of alliance defense ministers in Brussels.

Among the questions left unanswered by Kramp-Karrenbauer's plan are whether the United Nations would grant a mandate for a force to patrol such a safety zone, whether Germany itself would participate and which other countries might contribute troops.

Çavuşoğlu said Turkish President Recep Tayyip Erdoğan had proposed an idea of an internationally protected safe zone in Syria about eight or nine years ago, but the offer was rejected by Germany and the U.S., Bloomberg reported.

Erdoğan said Saturday that his country will make sure the Syrian Kurdish militia YPG moves from the Turkish-Syrian border if Russia does not take care of it, Reuters reported.

In the so-called Sochi deal, Erdoğan and Russian President Vladimir Putin agreed Turkey would halt its offensive in return for the withdrawal of Kurdish forces to 30km south of the Turkish border. “If this area is not cleared from terrorists at the end of the 150 hours [of ceasefire], then we will handle the situation by ourselves and will do all the cleansing work,” Erdoğan said in a speech in Istanbul.

Meanwhile, Erdoğan should be investigated and indicted for war crimes over his country’s military offensive in Syria, according to a former member of the U.N. Commission of Inquiry on Syria.

Carla del Ponte, a former Swiss attorney general who prosecuted war crimes in Rwanda and the former Yugoslavia, said "for Erdoğan to be able to invade Syrian territory to destroy the Kurds is unbelievable."

According to Reuters, she told the Swiss newspaper Schweiz am Wochenende: “An investigation should be opened into him and he should be charged with war crimes. He should not be allowed to get away with this scot free.”