Ukrainian law enforcement authorities are checking the circumstances under which Russian opposition leader Leonid Razvozzhayev, who was put on Russia's national wanted list, entered the territory of Ukraine and then left it, an informed source told Interfax-Ukraine.

"At present, law enforcers are probing the circumstances in which he arrived in Ukraine and then left," the source said.

Meanwhile, the press center of the Ukrainian Security Service said that neither the Russian Federation nor Interpol had made any official report about his detention.

As reported, Russian opposition activist Sergei Udaltsov said at a rally in Moscow on Saturday that Razvozzhayev, whom Russian authorities declared wanted on suspicion of preparing mass disturbances across the country, had been detained by unidentified people in Kyiv and brought to Moscow.

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