ayrock, which operated out of Trump Tower but is now dormant, funded Trump real estate projects by funneling foreign investment through an Icelandic bank called the FL Group, which investigators suspect laundered dirty money from Russia and elsewhere.
https://www.rawstory.com/2017/06/trumps-links-to-russian-money-laundering-raises-new-questions-about-secret-real-estate-deals-since-election/