I should have bet money.
  Russia Raises the Pressure in Ukraine -- Update 
  By Lukas I. Alpert and Alexander Kolyandr 
  Ukraine  accused Russia of sending troops outside the Crimean peninsula and onto  the Ukrainian mainland for the first time on Saturday, as Moscow said  it received calls to "protect peaceful civilians" in eastern Ukraine and  is considering the requests. 
       Ukraine's foreign ministry  issued a protest against the troop landing in the Kherson region near  Crimea, and demanded an immediate withdrawal. The ministry said about 80  troops had landed along with four helicopter gunships and three armored  vehicles. It warned that Ukraine "reserves the right to use all  necessary measures to stop the military invasion by Russia." 
       Ukrainian news services reported the Russian troops seized a natural gas distribution station. 
        The standoff comes a day before Crimea is set to vote on whether to  secede from Ukraine and join Russia and as thousands of Russian  soldiers engage in readiness exercises just across the border, raising  already heightened concerns about Russian intentions in eastern Ukraine.  
       On Saturday acting president Oleksander Turchinov warned  that there was "a real danger" of invasion by Russian troops across  Ukraine's eastern border and that Ukraine's parliament would convene  Monday morning because of it. "The situation is very dangerous," he said  in parliament on Saturday. "I'm not exaggerating." 
        Russia's Foreign Minister Sergei Lavrov has said Russia hasn't plans for  military action in eastern Ukraine. But Russia issued similar  assurances before it invaded Crimea, and lately Moscow has asserted it  has the right to protect people in eastern Ukraine. 
       The  Kremlin foreign ministry in its statement said there had been "numerous  calls on Russia to protect peaceful civilians" inside Ukraine and that  "these appeals will be considered." 
       Mr. Lavrov said Russia  believes the new government in Kiev isn't in control of the situation in  the majority ethnic-Russian cities where recently ousted President  Viktor Yanukovych drew much of his support and where support is strong  for closer ties to Russia. 
       Russia similarly cited the need  to protect ethnic-Russians in Crimea after thousands of well-armed  soldiers wearing unmarked uniforms but believed to be Russian occupied  the peninsula that is home to Russia's Black Sea Fleet and cut it off  from Ukrainian control. 
       Leaders in the U.S. and Western  Europe have threatened economic sanctions against Russia if the soldiers  don't leave Crimea, and they have said they wouldn't recognize the  results of Sunday's hastily-planned vote. But Russian President Vladimir  Putin has signaled he has no intention of backing down and the  referendum, which was called on March 6 by regional leaders installed  after the soldiers appeared, is expected to go forward as planned. 
        Meantime, Russia on Saturday vetoed a U.N. Security Council  resolution that called on nations not to recognize the results of  Sunday's referendum in Crimea on whether to secede from Ukraine and join  Russia. 
       The Russian foreign ministry said on Saturday that  it was concerned about "disturbing information" it was receiving from  the eastern Ukrainian cities of Kharkov, Donetsk and Lugansk about the  "excesses" of ultranationalists Russia has accused the new government in  Kiev of empowering. 
       The Ukrainian government says the disturbances have been sparked by Russians who have crossed the border into the cities. 
        Late Friday, two people were killed in clashes between rival groups  of protesters in Kharkov, which local governor Ihor Baluta said were  the "result of a well-planned provocation." Police said dozens had been  arrested Saturday and the investigation was continuing. On Thursday  night, at least one person was killed in the eastern city of Donetsk in a  similar clash. 
       In Kharkov, police said the violence broke  out when a minibus with Ukrainian nationalists approached a rally of  pro-Russian protesters at the city's main square. According to  eyewitness accounts, a heated verbal confrontation quickly escalated  into violence. The bus moved to a side street, where the pro-Russian  demonstrators surrounded the pro-Ukrainian activists occupying a  cultural center they were using as an impromptu headquarters. 
        The violence lead to gunfire that continued when police arrived. One  policeman was critically wounded. Police didn't identify which side was  responsible for the shooting and an eyewitness said it appeared that  both the pro-Russian and pro-Ukrainian groups used firearms. 
        Only after the arrival of the local authorities did the besieged  pro-Ukraine activists agree to leave the building. Ukraine's interior  minister said protesters from both sides had been arrested on Saturday. 
       Alan Cullison contributed to this article. 
    Write to Lukas I. Alpert at lukas.alpert@wsj.com and Alexander Kolyandr at Alexander.Kolyandr@wsj.com 
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