Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: Police detain a protester in downtown Moscow, Russia, Sunday, May 26, 2017. Russia's leading opposition figure Alexei Navalny and his supporters aim to hold anti-corruption demonstrations throughout Russia.... (Associated Press) 
  
 Police detain a protester in downtown Moscow, Russia, Sunday, May 26, 2017. Russia's leading opposition figure Alexei Navalny and his supporters aim to hold anti-corruption demonstrations throughout Russia. But authorities are denying permission and police have warned they won't be responsible for "negative... (Associated Press) 
  
 MOSCOW (AP) — Thousands of people crowded into Moscow's Pushkin Square on Sunday for an unsanctioned protest against the Russian government, the biggest gathering in a wave of nationwide protests that were the most extensive show of defiance in years. 
  
 Alexei Navalny, the anti-corruption campaigner who is leading the opposition to President Vladimir Putin, was arrested while walking from a nearby subway station to the demonstration at Moscow's iconic Pushkin Square. 
  
 Navalny and his Foundation for Fighting Corruption had called for the protests, which attracted hundreds or thousands in most sizeable Russian cities, from the Far East port of Vladivostok to the European heartland including St. Petersburg. 
  
 The protests were the largest coordinated outpourings of dissatisfaction in Russia since the massive 2011-12 demonstrations that followed a fraud-tainted parliamentary election. 
  
 Police estimated the Moscow crowd at about 7,000, but it could have been larger. The one-hectare (2.5-acre) Pushkin Square was densely crowded as were sidewalks on the adjacent Tverskaya Street. 
  
 State news agency Tass cited Moscow police as saying about 200 people were arrested. 
  
 Russia's beleaguered opposition is often seen as primarily a phenomenon of a Westernized urban elite, but Sunday's protests included gatherings in places far from cosmopolitan centers, such as Siberia's Chita and Barnaul. 
  
 "Navalny has united people who think the same; that people don't agree with the authorities is obvious from what is going on in the country today," Anna Ivanova, 19, said at the Moscow demonstration. "I am a bit scared." 
  
 Scuffles with police erupted sporadically and the arrested demonstrators included a gray-haired man whom police dragged along the pavement. Police cleared the square after about three hours and began herding demonstrators down side streets. 
  
 "It's scary, but if everyone is afraid, no one would come out onto the streets," Yana Aksyonova, 19, said. 
  
 The protests Sunday focused on reports by Navalny's group claiming that Prime Minister Dmitry Medvedev has amassed a collection of mansions, yachts and vineyards. The alleged luxuries include a house for raising ducks, so many placards in Sunday's protests featured mocking images of yellow duck toys. 
  
 "People are unhappy with the fact that there's been no investigation" of the corruption allegations, said Moscow protester Ivan Gronstein. 
  
 In the Pacific port city of Vladivostok, police forcefully detained some demonstrators near the city's railway terminal, in one case falling down a small grassy slope as they wrestled with a detainee. 
  
 News reports and social media reported demonstrations in large cities throughout the country, including Novosibirsk, Tomsk and Krasnoyarsk. At least 25 people were reported arrested in Vladivostok and 12 in Khabarovsk. 
  
 Some demonstrators showed up with their faces painted green, a reference to a recent attack on Navalny in which an assailant threw a green antiseptic liquid onto his face. ||||| Moscow (CNN) Hundreds of people, including a prominent opposition figure, were arrested in Moscow Sunday for participating in unauthorized protests, according to state media and a human rights group. 
  
 The demonstrators were attending a large-scale anti-corruption demonstration in Moscow. 
  
 State-run news outlet Tass reported that 8,000 people attended the protest in Moscow alone. Similar protests were planned in 100 cities across Russia, according to organizers. 
  
 Opposition supporters take part in an unauthorized anti-corruption rally in central Moscow on Sunday. 
  
 Russian human rights group OVD-Info tweeted that more than 700 had been detained in Moscow -- while state-run news agency Ria Novosti said 500 had been held. 
  
 Among those detained was Kremlin critic Alexey Navalny, according to tweets by Navalny and his press secretary. 
  
 "Today we are discussing (and condemning) corruption, not the detentions. Well, I was detained. So what. It OK. There are things in life that are worth being detained for," Navalny tweeted. 
  
 The demonstrations come at a time when the safety of critics of Vladimir Putin is under scrutiny. On Thursday, a former Russian lawmaker and vocal critic of the Russian government, Denis Voronenkov, was shot dead outside a luxury hotel in the Ukrainian capital Kiev. 
  
 Navalny has not commented on the killing. CNN has contacted him for comment. 
  
 JUST WATCHED Chilling video shows Kremlin critic's death Replay More Videos ... MUST WATCH Chilling video shows Kremlin critic's death 02:24 
  
 Condemnation 
  
 The US State Department spoke out against the arrests. 
  
 "The United States strongly condemns the detention of hundreds of peaceful protesters throughout Russia on Sunday," acting State Department spokesperson Mark Toner said in a statement. 
  
 "We were troubled to hear of the arrest of opposition figure Alexei Navalny upon arrival at the demonstration, as well as the police raids on the anti-corruption organization he heads." 
  
 Toner said, "Detaining peaceful protesters, human rights observers, and journalists is an affront to core democratic values." 
  
 Police detain a protester in central Moscow on Sunday. 
  
 The protest drew a heavy police presence but remained largely peaceful. Riot officers flanked crowds while plainclothes officers moved among the demonstrators. Police told those on the street that the protest was unsanctioned and asked them to move on. 
  
 Navalny praised turnouts for the protests in early morning tweets. "Far East started fine," he tweeted, referring to a photo of protesters gathering in the city of Vladivostok, located on Russia's far eastern coast. Navalny also shared photos and tweets from various parts of the country. 
  
 Opposition supporters participate in an anti-corruption rally in central St. Petersburg on March 26, 2017. 
  
 'He is not your Dimon' 
  
 The protests are part of a campaign called "He is not your Dimon," which uses the diminutive form of the Russian name Dmitry to refer to Prime Minister Dmitry Medvedev. 
  
 Navalny has accused Medvedev of amassing a global property empire through various forms of corruption. 
  
 In a report published on March 2, Navalny said Medvedev has a portfolio of assets including "huge pieces of land in the most sought-after regions, yachts, apartments in old mansions, agricultural complexes and wineries in Russia and abroad." Navalny's report claims this was all purchased through "bribes from oligarchs, and state bank loans." 
  
 Police officers detain a man during an unauthorized anti-corruption rally in central Moscow on March 26. 
  
 Medvedev's spokeswoman, Natalya Timakova, told state-run news agency RIA Novosti, "It is pointless to comment on the propagandistic outbursts of a convicted opposition figure, who has already announced he is running some kind of election campaign and fighting against the authorities." Kremlin spokesman Dmitry Peskov called the report "not the first creative effort from this well-known convicted citizen," according to Tass. 
  
 Moscow protest in sight of Kremlin 
  
 Protesters in Moscow walked along Tverskaya Street, one of the city's main arteries that starts at the Kremlin walls. "I can't support our government, really," one protester said. "They steal our money using their power." 
  
 The Moscow Police Department put out a statement Thursday urging people not to attend, calling it illegal and warning of a high risk of "provocative acts, designed to violate public order." Police said the organizers of the event were offered an alternative location but declined. The Kremlin said Friday the event was "illegal" and a "provocation." 
  
 Navalny, who rose to prominence during the large-scale anti-government protests in Russia in 2011, has announced he plans to run for the Russian presidency in 2018. 
  
 In February, he was found guilty of embezzlement in a retrial of a case that dates back to 2013. Russian law prevents convicted criminals running for public office, but Navalny has appealed the verdict. |||||
Student:
Protests against Kremlin corruption swept across Russia on Sunday, with thousands gathering in one Moscow square alone where opposition leader Alexei Navalny was arrested, reports CNN. Navalny sought to downplay his arrest—though between 100 and 200 were said to have been detained—tweeting, "Today we are discussing (and condemning) corruption, not the detentions. Well, I was detained. So what. It ok. There are things in life that are worth being detained for." At issue is a report from Navalny's group that claims PM Dmitry Medvedev has collected riches that include yachts, mansions, vineyards, and a widely mocked house for raising ducks. "Navalny has united people who think the same; that people don't agree with the authorities is obvious from what is going on in the country today," one 19-year-old protester tells the AP. "I am a bit scared."