Activists protest against Assange's four-year prison sentence in London.

Do World Opera – Wikileaks founder Julian Assange yesterday (19) completed four years of imprisonment in Ecuadorian embassy In London. To mark the date, capitals of several countries will hold demonstrations in support of the Australian, and he will make pronouncements via teleconference.

With the slogan "First they came for Assange...", the protests are scheduled throughout the week in Madrid, New York, Quito, Athens, Buenos Aires, Belgrade, Berlin, Brussels, Milan, Montevideo, Naples, Paris, and Sarajevo.

Several international figures have announced their participation in the activities, including linguist Noam Chomsky; philosopher Slavoj Zizek; former Greek Finance Minister Yanis Varoufakis; musicians Brian Eno, Patti Smith, and PJ Harvey; Argentine Nobel laureate Adolfo Pérez Esquivel; Chinese artist and activist Ai Weiwei; illustrator Vivienne Westwood; and directors Michael Moore and Ken Loach.

Since 2010, Assange has been persecuted by Sweden. To avoid extradition to that country, where he is accused of sexual crimes, the activist is taking refuge in the diplomatic headquarters of the South American country that granted him political asylum.

Assange fears being extradited to Sweden because he believes the sexual assault accusation is a pretext to send him to the United States, where he is accused of revealing thousands of classified documents and could face a life sentence for espionage.

Although the The UN has already expressed its opinion. In defense of Assange, the United Kingdom maintains its willingness to arrest him as soon as the activist leaves the Ecuadorian embassy. This is because the Swedish Public Prosecutor's Office issued a European arrest warrant and renewed it in May of this year.