"Theresa May - who kept him imprisoned in the embassy for 5 years - refuses to allow him to leave", she wrote.
"Theresa May, who is on her last legs. Theresa May of the Pyhrric victory. Theresa May, who won't shake the hand of the victims of the Grenfell fire. Who doesn't care about poor people. Who doesn't care about justice or peace. Who doesn't care about Julian."
Bizarrely she finished off the letter by comparing letting Julian go to the end of animal cruelty, writing:
We must turn the world around. Stop escalating cyberwars. Stop geopolitical sabre-rattling. Stop interfering in elections. Stop torturing animals and eating them. Stop writing speeches on goatskin. Letting Julian go free would change everything. For a better world!
Assange responded to the letter by reposting it on Twitter with the caption, "This is quite something."
The 45-year-old is set to make an announcement tomorrow (June 19th UK time) on the fifth anniversary of his detainment.
This article originally appeared on Marie Claire.