"Russia Challenges Islamic State Link to Moscow Concert Attack"

Russia challenges U.S. claims that Islamic State was behind the deadly concert hall attack near Moscow, suggesting a Ukrainian link and accusing Washington of covering for Ukraine. Four alleged gunmen, including at least one Tajik, appeared in a Moscow court on terrorism charges. President Putin has implied a Ukrainian connection, while Ukraine denies any involvement. The U.S. has publicly stated its belief in Islamic State's responsibility, but Russia questions this assertion and accuses the U.S. of evoking the militant group to protect its interests in Ukraine.