article_snippet: we have reported it to Vladimir Putin.'
article_snippet: Vladimir Putin stressed the Lubyanka was continuing 'necessary operative and investigative work' on the case.
article_snippet: Fellow opposition leaders have vowed to ensure a report alleging the Kremlin was deeply involved in the bloody war in eastern Ukraine is published.
article_snippet: But the investigation is still seeking those who ordered the brutal killing.
article_snippet: Earlier this week Vladimir Putin called for an end to the 'shame' of political killings which have plagued the Kremlin in recent years .
article_snippet: Vladimir Putin was the most prominent opposition figure to be killed in Russia during Vladimir Putin's 15-year rule.
article_snippet: News of the arrest comes as Vladimir Putin earlier this week demanded an end to 'shameful' political assassinations in the wake of the shooting.
article_snippet: In a speech with officials from the interior ministry, Vladimir Putin said: 'The most serious attention should be paid to high-profile crimes, including the ones with a political subtext. '
article_snippet: Russia should be devoid at last of the kind of shame and tragedies that we have recently endured and seen.
article_snippet: Earlier on Wednesday, the director of Russia's Federal Security Service said that an investigation had identified several suspects, without giving details.