Turkish Prime Minister Tayyip Erdogan offered what the government said were unprecedented condolences on Wednesday to the grandchildren of Armenians killed in World War One by Ottoman soldiers.
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In a statement issued on the eve of the 99th anniversary of the deeply contested deaths, Erdogan unexpectedly described the events of 1915 as "inhumane", using more conciliatory language than has often been the case for Turkish leaders.
A Turkish government official said it was the first time a Turkish prime minister had offered such explicit condolences, but it was not immediately clear if it would be enough to bring about a thaw in relations between Ankara and its neighbor.
The exact nature and scale of what happened during fighting that started in 1915 is highly contentious and continues to sour relations between Turkey and Armenia, a former Soviet republic.
Turkey accepts that many Armenians died in clashes, but denies that up to 1.5 million were killed and that this constituted an act of genocide - a term used by many Western historians and foreign parliaments.
Earlier in April, for example, a U.S. Senate committee resolution branded the massacre of Armenians as genocide.
Erdogan's statement - unusually released in nine different languages including Armenian - repeated previous calls for dialogue between the two countries, and the setting up of a historical commission to probe events surrounding the killings.
"It is with this hope and belief that we wish that the Armenians who lost their lives in the context of the early 20th century rest in peace, and we convey our condolences to their grandchildren," he said.
"Having experienced events which had inhumane consequences - such as relocation - during the First World War, should not prevent Turks and Armenians from establishing compassion and mutually humane attitudes among towards one another."
'No cause for hostility against Turkey'
Although striking a conciliatory tone, Erdogan re-iterated a long-held Turkish position that the deaths of millions of people during the violence of the period should be remembered "without discriminating as to religion or ethnicity."
Turkey is a majority Muslim state, while Armenia is Christian.
"Using the events of 1915 as an excuse for hostility against Turkey and turning this issue into a matter of political conflict is inadmissible," he added.
Armenia has up to now declined the offer for a joint historical commission, as it regards the alleged genocide as an established historical fact and believes Turkey would use such a commission to press its own version of events.
Armenia accuses the Ottoman authorities at the time of systematically massacring large numbers of Armenians, then deporting many more, including women, children and the elderly and infirm in terrible conditions on so-called death marches.
Last December, Turkish Foreign Minister Ahmet Davutoglu made Turkey's first high-level visit to Armenia in nearly five years, raising the prospect of a revival in peace efforts between the historical rivals which stalled in 2010.
Turkey cut ties and shut its border with Armenia in 1993 in support of Turkic-speaking Azerbaijan, which was then fighting a losing battle against Armenian separatists in Karabakh. The frontier remains closed.