It's just a clash of power between the UN and the US. Similar with what's going on in the EU with Macron vs Merkel. One party wants World Gov't under technocratic elite,the other World Gov't under the suzeranity of their own country/deep state. The circumstances are just that in these cases both the UN (supporting Assange) and Macron (supporting hard Brexit) happen to support the right cause, albeit for all the wrong reasons.