(QHA) -

U.S. Secretary of State John Kerry says Russia must do more to end the crisis in Ukraine, RFE/RL reports.

Kerry said he welcomed the move by Russia's upper house of parliament to cancel the authorization for military intervention in Ukraine, but said that it "can be reversed in 10 minutes and everyone knows that."

Kerry said Russia must take "concrete" steps to resolve the Ukraine crisis.

He said Russian President Vladimir Putin must publicly call for pro-Russian separatist rebels to give up their weapons, end Moscow's support for them, and help secure the release of hostages.

He said if Putin failed to make real commitments on the ground in Ukraine in the "next days and weeks" will mean tougher sanctions against Russia.

Senators in the Federation Council voted 153 to 1 on June 25 to revoke the resolution -- adopted in March -- that provided for Russia to use its military forces in Ukraine if needed.

QHA