Upvote:2
This is newly the case.
(Information retrieved from the US embassy in Turkey as it was updated recently and in English).
On June 11, Turkey announced opening the majority of its international air, land, and sea borders. The border with Iran remains closed.
Flights are starting to resume to Turkey. To enter Turkey all travelers must have a HES code (Hayat Eve SΔ±Δar) for domestic and international flights, train and ferry travel. This can be obtained here.