In the case of Assange, Australian politicians did a lot of work to get him released in the end[1], including:

* Sending a delegation representing all major political parties to the US to argue for the release of Assange. Imagine picking the Republican and Democrat politician LEAST likely to want to cooperate on anything, and those two would have been Australia's equivalent representatives in this delegation. Reports afterwards of the meeting at DOJ HQ indicated it wasn't the type of meeting where the Australians would have brought Tim Tams to share around the room.[2]

* The Australian parliament voted publicly 2:1 on a motion for Assange's release.

* Repeated petitioning through ambassadors in the UK and US, official visits of Australian politicians, etc. Not in private either, as is typically the case for diplomatic affairs.

* Australian politicians attending UK extradition hearings.

* After getting agreement to a plea deal, flying Australian ambassadors for the UK and US to the court of a one-pub-town in the middle of the Pacific Ocean no one has heard of (Northern Mariana Islands) in support of Assange, then all of them flying back to the Australian prime minister's aircraft terminal for a welcome home bevvy.

This was all at a time too where "Free Assange" posters and graffiti was _widely_ distributed across Australian cities.

[1] https://en.wikipedia.org/wiki/Julian_Assange#Plea_bargain_an...

[2] https://www.abc.net.au/news/2024-06-27/inside-the-us-austral...