Not sure if you are aware, but the F-35 program consists of several partners including the UK, the Netherlands, Norway, Denmark, etc.
Is this real ? After the way US treat Turkey on S400, kick them from F-35 program, distrurb some of Turkey defense export drive, and even still hold approval for F-16B. Now Biden team even ask Turkey on sending the S400 to Ukraine?
Don't talk yet on Sultan Erdo wiling to completely cut Turkey relationship to Russia (as Turkey keep saying they want to keep relationship with both Ukraine and Russia). Is US even consider how Turkey feeling on US various treatment to them lately ? Now they ask this?
I don't know if this is Biden administration desperation, or they simply don't read how Biden administration image in some of their 'allies' in middle east. Biden already ask Saudi for increase in Oil production, which Saudi Crown Prince basically turn him down. Now asking Sultan Erdo on this ? Is either simply arrogance and clueless, or desperation from Biden's team in reading middle east.
All partners agreed that as long as Turkey is operating the S-400 system they cannot receive the F-35.
I don't think this idea of relocating the S-400 from Turkey to Ukraine is an indication of "desperation" -- I think it's just an idea some diplomats came up with to try to kill two birds with one stone:
1. Get Turkey back to the F-35 program (and also reduce a major friction point between Turkey and other NATO countries, including those not operating F-35...) and
2. provide Ukraine with additonal defense capabilities.
I don't think it's going to happen though -- Turkey will not give up their S-400 as long as Erdogan remains in power in Turkey.