Following news about the Dutch alerting US agencies to the Russian hack, I'm reminded of the fact that European intel had info on Trump associates meeting with Russians close to the Kremlin in the Netherlands. To my knowledge, details of these meetings are still entirely unclear. 
I asked the Dutch Ministry of Foreign Affairs if anyone in their office met with any of the Trump advisers during the election season and the answer was no. Whoever it was that traveled to the Netherlands wanted to be acting in an unofficial capacity.
Following the election, GOP donor/Ukrainian foreign agent/informal Rohrabacher adviser Yuri Vanetik traveled to the Netherlands at least twice. In April 2017, he, Rohrabacher, Paul Behrends, and 2 unknown men dined in The Hague. 
Behrends was ousted from his role as staff director for the House Foreign Affairs subcommittee in July after it was discovered that he had a close working relationship with Natalia Veselnitskaya and Rinat Akhmetshin in their Anti-Magnitsky efforts. politico.com/magazine/story…
I think it be fruitful to dig into these Netherlands meetings. The two Trump foreign advisers that we know traveled to Europe multiple times are Carter Page (Russia, Hungary) and George Papadopoulos (Greece, UK, Cyprus, Israel).
As always, if you have any tips, suggestions, or requests to investigate, my DMs are open. Signal/Text: +6572176295. Email: SMSnews@protonmail.com
