Turkey condemned a decision by the US House of Representatives to recognize the mass killings of Armenians by the Ottoman Empire as genocide, saying on Wednesday it would damage the "critical" relationship between the NATO allies.
Armenia praised Tuesday's vote, which Prime Minister Nikol Pashinyan hailed on Twitter as "a bold step towards serving truth and historical #justice."
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But in Turkey, government ministers and officials said the timing of the vote, after weeks of international criticism of Ankara's military incursion against Syrian Kurdish forces, showed it was politically motivated.
The Foreign Ministry said US Ambassador David Satterfield had been summoned on Wednesday.
President Tayyip Erdogan, who is due to meet US President Donald Trump at the White House in two weeks, said he had not decided yet whether the trip was going ahead.
Asked whether he would make the visit after recent developments, Erdogan said the issue remained "a question mark."
Speaking to lawmakers from his AK Party, Erdogan said the resolution won support because of the fallout in the United States over Ankara's operation in northeast Syria against the Kurdish YPG militia, which was the main US partner in the battle against Islamic State in Syria.
"These efforts... were passed by the House of Representatives, using a negative air that has formed against our country among the American public," Erdogan said. "In a sense, they were being opportunistic."
Erdogan said an Armenian militant group killed more than 40 diplomats in attacks on Turkish missions in 21 countries in the 1970s and 1980s.
"We reject... unilateral judgments on events more than a century ago, that doesn't even mention Turkey's losses," he said.
Erdogan's communications director called Tuesday's vote deeply troubling. "Those who voted for this resolution will be responsible for the deterioration of a critical strategic relationship in a turbulent region," Fahrettin Altun said.
Altun repeated a call by Erdogan to form a historical commission to investigate the events.
Turkey accepts that many Armenians living in the Ottoman Empire were killed in clashes with Ottoman forces during World War One, but contests the figures and denies that the killings were systematically orchestrated and constitute a genocide.
