"* The US leases airbases in Turkey, with nuclear penetration bombers and nuclear warheads stored on site."
My understanding is that the bombs are on site, but the bombers are not.
This from 2019 by The Federation of American Scientists supports that view.[1] "The remaining 50 bombs are for use by US jets, even though Turkey never allowed the US Air Force to permanently base fighter-squadrons at Incirlik. Jets would have to fly in during a crisis to pick up the weapons or they would have to be shipped to other locations before use. As a result, the nuclear posture at Incirlik has been more a storage site than a fighter-bomber base during the past two decades."