Turkey and Armenia have signed a historic accord normalising relations after a century of hostility¹.

经过一个世纪的敌对，土耳其与亚美尼亚签署了一项历史性关系正常化协议。

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The two countries signed the protocols under the watchful eyes of big powers

The deal was signed by the two foreign ministers after last-minute problems delayed the ceremony in Switzerland.

Under the agreement, Turkey and Armenia are to establish diplomatic ties and reopen their shared border.

The accord（调和，协议） has been met by protests in Armenia, where many people say it does not fully⁴ address the 1915 killing⁵ of hundreds of thousands of Armenians.

Objections

Armenia wants Turkey to recognise the killings⁶ as an act of genocide, but successive（连续的） Turkish governments have refused to do so.

The agreement calls for a joint⁷ commission of independent historians to study the genocide issue.

Turkish Foreign Minister Ahmet Davutoglu and his Armenian counterpart, Edward Nalbandian, signed the protocols（协议） in Switzerland after a delay of more than three hours.

The BBC's Kim Ghattas in Zurich says the Armenians had apparently⁸ raised objections to remarks due to be read out by the Turkish delegation⁹.

After the signing neither side issued a statement, and our correspondent says this seems to have been the compromise arranged by US officials.

The administration of President Barack Obama had been pressing the parties to reach agreement.

The ceremony was attended by US Secretary of State Hillary Clinton, as well as Russian Foreign Minister Sergei Lavrov and the EU's High Representative for the Common Foreign and Security Policy, Javier Solana.

Mrs Clinton later said the US would build on the "milestone¹⁰" that had been achieved, but admitted "concerns on both sides" had delayed the signing.

A senior state department official told Associated Press that Mr Obama had called Mrs Clinton "to congratulate her and the team" on their role in the signing.

The accord needs to be ratified¹¹（批准） by the parliaments of both Armenia and Turkey.

On Friday thousands of people protested against the deal in the Armenian capital, Yerevan.

"The international recognition of the Armenian genocide will be hindered（阻碍，打扰） by this signature, or ratification（批准，认可）," said Vahan Hovanissyan, a member of parliament for the nationalist Dashnaktsutyun party.

One protester told the BBC he was not opposed to the opening of the border, but was "against the setting up of a commission that will allow Turkey to further postpone¹² declaring the killings as genocide".

Hundreds of thousands of Armenians died in 1915, when they were deported¹³ en masse（全体地，一同地） from eastern Anatolia by the Ottoman Empire. They were killed by troops or died from starvation and disease.

Armenians have campaigned for the killings to be recognised internationally as genocide - and more than 20 countries have done so.

Turkey admits that many Armenians were killed but says the deaths were part of the widespread fighting that took place in World War I.

A roadmap for normalising relations between Turkey and Armenia was agreed in April.

Turkey closed its border with Armenia in 1993 because of its war with Azerbaijan over the disputed region of Nagorno Karabakh.

Correspondents say most people in Armenia feel their landlocked country has been too isolated¹⁴ since the Turkish border closed and are ready for it to reopen.