There are a couple of ways to define this - "joining the F-35 program" would generally refer to restoring their status as a partner in the program, whereas you might also mean that they could have sales approved by the U.S. and other program members. Are you only counting if they join the program as manufacturing/research partners as they had initially been, or is any sale of F-35's to Turkey going to resolve this to yes?

@BungalowBernard Selling F-35s to Turkey would resolve yes.