It's much more complicated to get to LatAm from Vladivostok than an Aeroflot flight from Moscow. I think there's simply no direct flights - it's not an airline hub.
Well, you can easily make it a direct flight. I have no idea how much hiring a pilot and a plane capable of crossing the pacific non-stop costs, but it's probably well within his (or his supporters) means.
By complicated I mainly meant the countries he does not have to fly over.
Even a 777 or 787 won't fly direct from VVO, around Japan, around US airspace, and around Mexican airspace and reach even Nicaragua safely. Much less will it make Bolivia or Venezuela, if it were even possible to cross foreign airspace to reach those countries.
