So, something of value was exchanged at the Don Jr/Russia meeting, after all

"Then Akhmetshin, a former Soviet military intelligence officer, piled on the pressure with a bombshell claim that Veselnitskaya had brought a plastic folder full of printed documents which contained claims of the Democratic National Committee receiving dirty Russian money.
That directly contradicted Don Jr's account that no information had been received from the visiting Russians."

http://www.dailymail.co.uk/news/article-4696514/Lobbyist-Russian-intel-ties-went-meeting.html