The Observer's 20 photographs of the week

This week's most compelling photojournalism came from Ukraine where the protests continued over President Viktor Yanukovych's refusal to sign a trade agreement with Europe. Here, riot police officers gather in front of protesters in Kiev. Violent clashes erupted and activists said that one person had been shot dead by the security forces Photograph: Anatolii Boiko/AFP

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko is attacked and sprayed with a fire extinguisher as he tries to stop the clashes between police and protesters in Kiev Photograph: Efrem Lukatsky/AP

An aerial view shows pro-European protesters burning tyres during the clashes with riot police in central Kiev Photograph: Reuters

There were more dramatic photographs this week from the eruption of Mount Sinabung in Indonesia. More than 26,000 villagers have been evacuated since authorities raised the alert status to the highest level in November last year Photograph: Beawiharta/Reuters

Villagers observe the sugar cane fields belonging to Ingenio San Antonio (ISA) burning in Chichigalpa, Nicaragua. Former workers of ISA clashed violently with police after demanding compensation for the damage to their health caused by alleged exposure to agrochemicals and pesticides. A former sugar cane cutter died after allegedly being shot by the police during the confrontations Photograph: Esteban Felix/AP

A model presents a creation for Schiaparelli during the Haute Couture Spring/Summer 2014 collection show in Paris Photograph: Francois Guillot/AFP

Nurses and other anti-government protesters listen to a speech by protest leader Suthep Thaugsuban in Bangkok. Thai authorities are 'very seriously' considering a state of emergency after violence in the capital Photograph: Damir Sagolj/Reuters

Justin Bieber appears in court via a video feed in Miami. Bieber was released from jail following his arrest on charges of driving under the influence, driving with an expired license and resisting arrest. Police say they stopped the 19-year-old pop star while he was drag racing down a Miami Beach street before dawn Photograph: Walter Michot/AP

Christian people crowd a bush taxi on their way to the market in Bangui Photograph: Eric Feferberg/AFP

A policeman guards a man arrested after members of the anti-Balaka militia looted houses and shop belonging to Muslims in Bangui, Central African Republic Photograph: Issouf Sanogo/AFP

The blisters on Rafael Nadal's left hand are photographed during an injury time out against Roger Federer during their men's singles semi-final at the 2014 Australian Open in Melbourne. Nadal beat Federer in three sets to reach the final Photograph: Paul Crock/AFP

A Syrian refugee boy plays with a ball at a refugee centre in the town of Harmanli, Bulgaria. The Bulgarian army has started to build a 30km fence at the border with Turkey to prevent an influx of illegal immigrants, who are predominantly asylum seekers from Syria Photograph: Stoyan Nenov/Reuters

Afghan children ride on ferris wheels near a cemetery in Kabul Photograph: Johannes Eisele/AFP

Firefighters tackle a bushfire which threatened properties in Wagga Wagga, New South Wales, Australia Photograph: Brad Newman/Newspix/Rex

A skater casts a shadow on the Rideau Canal in Ottawa as temperatures plummeted to -25ºC Photograph: Chris Wattie/Reuters

Children look over a fence of their makeshift shelter in Islamabad, Pakistan Photograph: Zohra Bensemra/Reuters

A Palestinian man looks out of a window beside bloodstains on the wall of a house at the scene of an Israeli air strike in Beit Hanoun, in the Gaza Strip. Israel killed two Gaza gunmen in the air strike, blaming one of them for firing rockets across the border during Ariel Sharon's funeral last week Photograph: Suhaib Salem/Reuters

In this photograph by Observer 20 regular contributor, Marco Longari, South African Sthandiwe Hlongwane, far left, stands with other women outside a newly built house in Nkandla that she received from the Economic Freedom Fighters' leader Julius Malema. The house sits directly opposite the lavish residence of South African President Jacob Zuma and has become a meeting place where activists listen to the grievances of locals who are disappointed with the ANC Photograph: Marco Longari/AFP

Egyptian people and security officers stand at the scene of a bomb attack at the Cairo Security Directorate building Photograph: Ed Giles/Getty

The 18th Dynasty mortuary Temple of Queen Hatshepsut is photographed from a hot air balloon over Luxor's West Bank in southern Egypt. The tourism industry is a vital part of the Egyptian economy and has been hit hard by the ongoing political turmoil since the revolution Photograph: Khaled Elfiqi/EPA