Turkey, though, denied any such assurances since two local employees of the USA consulate in Istanbul were held on suspicion of ties to last year's failed coup against President Tayyip Erdogan.
"The Department of State is confident that the security posture has improved sufficiently to allow for the full resumption of visa services in Turkey", it said.
"We do not find it right for the United States to claim it had received assurances from Turkey and misinform the USA and Turkish publics", the embassy said, according to a BBC translation.
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Turkey reciprocated the measure shortly thereafter, blocking non-immigrant visa services for USA citizens.
The U.S. remains concerned about the existing allegations against workers for the U.S. Mission in Turkey as well as allegations against U.S. citizens in the country, which sparked the crisis in October. Turkey retaliated by taking a similar step.
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"In accordance with the principle of reciprocity, restrictions on visa services applied to American citizens have been lifted simultaneously", the Turkish embassy said in a statement.
But the Turkish embassy statement took issue with this, saying that "Turkey is a state of law" and "no such assurances have been given regarding cases pending in the courts".
But the services were so limited that the first interview appointments for Turks seeking most types of U.S. visa were only available from January 2019, causing uproar on social media.
The Turkish embassy in Washington said, however, that it had not offered any assurances to the United States over its detained staff.
The Turkish government wants the USA to extradite Gulen to Turkey, for his alleged involvement in the failed coup. We are also concerned about the cases against USA citizens who have been arrested under the state of emergency.
Topuz, a Turkish citizen, is accused of links to a group led by Pennsylvania-based Muslim cleric Fethullah Gulen, who Ankara suspects of ordering last year's failed coup in Turkey.
"In the USA the description in the context of assurance mentioned, Turkey is a state of law, with regard to file ongoing judicial process did not give any assurance of our government, due to the exercise of their official duties no representations officials in our country, we want to emphasize that the criminal investigation, subjecting".
It further added that Turkey had serious concerns regarding the cases of Turkish nationals in the United States.