I think there is one effective way To stop trump from selling out to Putin at least temporarily.

As difficult as it is we must get a trump voters on camera saying they are displeased with these new turn of events.

This should in turn give him some pause and maybe just maybe not go through with the let's sell out the country shit.

One clue is that among Trump Voters( Although few at the moment) is that for this Is the camel that broke the Horses back As they no longer have any Patriotism ground to stand on.