The Vautour IIA # 8 was used to test airial refuelling with the Mirage IV. This aircraft was later sold to Israël in 1967.
The Vautour (first flight in 1953) was Mach 1 capable (the 2nd french aircraft to do this, but with the nose slighty down).
In 1957, refuelling tests were done but no Vautour retain this capacity as no refueller was on order for french air force.
Despite that, when the Mir IV was in its own tests, the need of a refueller was solved by the use of a Vautour which only simulated dry transfer with a Douglas refueling fairing.
It seems that another projet includes a Sud Est Caravelle (!?).
All of that was forgotten once Kennedy gave Green Flag to the sale of C-135 F (KC-135 subversion for french ) in 1962.
If ready french does not afraid you, I have several links to provides to you and even a book on the Vautour (sold out but sometimes via bids