The 2nd one seems to cover all you mentioned. He had a position in the St Petersburg mayors office issuing export licenses through the criminally controlled port. Bribes were the way forward. Medvedev was involved too.
They tried, something like five times, to film inside the palace, vineyards and locked off beach with drones. One effort succeeded.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”