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Russia is still reeling from Friday's attack. Authorities have confirmed at least 137 dead. Suspects, some showing signs of torture, have been charged. Here are other key developments.
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Four men accused of staging the Russia concert hall attack that killed more than 130 people appeared before a Moscow court Sunday showing signs of beatings as they faced formal terrorism charges.
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The Russian president described the violent shooting as "a bloody, barbaric terrorist act" after a group linked to the Islamic State claimed responsibility for the event.
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Several gunmen wearing camouflage burst into a concert venue and opened fire. A fire broke out and some were trapped inside. Eleven people have been detained, Russian officials said.
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The Ukrainian energy minister said the nighttime drone and rocket attacks were "the largest attack on the Ukrainian energy sector in recent times." At least three people were killed, officials said.
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Russian President Vladimir Putin will extend nearly a quarter century of rule for six more years after wrapping up an election that gave voters no real alternatives.
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A Navalny spokesperson said the assailant smashed a window of Leonid Volkov's car, sprayed tear gas into his eyes and started hitting him with a hammer in Lithuania's capital.
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The Pentagon will rush about $300 million in weapons to Ukraine after finding some cost savings in its contracts, even though the military remains deeply overdrawn.
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Sweden has formally joined NATO as the 32nd member of the transatlantic military alliance, ending decades of post-World War II neutrality as concerns about Russian aggression in Europe have spiked.
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German officers were reportedly talking about sending weapons to Ukraine and a potential strike by Ukrainian forces on a bridge in Crimea. The German chancellor called the incident "very serious."