Condemning racism and police heavy-handedness, thousands of people attended a "march of dignity" rally in Paris to mark a decade since the deaths of two youths sparked nationwide riots.
The colours blue and green symbolise the rift between opposing political parties in Taiwan, an entrenched divide that polarises friends and families, with this weekend's historic China summit adding fuel to the fire.
Activists set a police car alight and scuffled with riot police in central London as thousands took part in a "Million Mask March" anti-capitalist demonstration night.
Thousands of people protested against migrants in towns around the Czech Republic, a week after the UN slammed the country's treatment of new arrivals as "degrading".
Malaysia increasingly resembles a "police state" as the government uses repressive laws to silence critics including those demanding the prime minister answer corruption allegations.
Montenegro's Prime Minister Milo Djukanovic brushed off violent protests calling for his resignation, insisting they were not a threat to his country's stability.
Germany's xenophobic PEGIDA movement drew widespread condemnation from lawmakers and Jewish groups after a speaker at an anti-refugee rally used Nazi-era rhetoric.
Tens of thousands of people massed in the eastern German city of Dresden in counter rallies over the anti-migrant movement PEGIDA, with one demonstrator left seriously injured in a brief clash between the two sides.
French President Francois Hollande said the social turbulence currently gripping Air France, which was rocked by violent protests over job cuts, was not a reflection of the state of the country.
Around 3,000 people rallied in the Montenegrin capital of Podgorica to back an opposition call for the left-wing government of Prime Minister Milo Djukanovic to resign.
Hundreds of pro-Kiev activists from Crimea's Tatar community launched a blockade of roads from Ukraine to the Crimean peninsula to protest Russia's seizure of their home region.
Thousands of people poured onto Moscow's streets for the first authorised opposition protest in a year-and-a-half, with Kremlin critic Alexei Navalny telling the crowds: "Change is possible."
Tens of thousands of people marched through London in protest against Britain's refugee policy, with new Labour Party leader Jeremy Corbyn attending in his first political engagement only hours after being elected.
Malaysia's Prime Minister Najib Razak criticised organisers of a weekend protest demanding his ouster, saying the timing and venue of the demonstration would clash with independence day parade rehearsals.
Hundreds of thousands of protesters demanded Brazilian President Dilma Rousseff's resignation, blaming her and the leftist Workers' Party for runaway corruption,