GeenPeil gained further publicity in 2015 by calling for an advisory referendum on the Ukraine–European Union Association Agreement. The call for this referendum was supported by several Dutch political parties, including the PVV, &lt;a href="Groep%20Bontes/Van%20Klaveren"&gt;Groep Bontes/Van Klaveren&lt;/a&gt;, SP, 50PLUS and PvdD. Opposing voices to the referendum stated that the subject was unsuitable for a 'substantive public discussion'; former minister of Economic Affairs Laurens Jan Brinkhorst said that in reality the referendum is not about the association agreement, but really is a "defining tool for either opposing or siding with Putin'.