Sri Lanka, April 27 -- U.S. intelligence agencies have determined that Russian President Vladimir Putin probably didn't order opposition politician Alexei Navalny killed at an Arctic prison camp in February, the Wall Street Journal reported on Saturday.

Navalny, 47 when he died, was Putin's fiercest domestic critic. His allies, branded extremists by the authorities, accused Putin of having him murdered and have said they will provide proof to back their allegation.

The Kremlin has denied any state involvement. Last month, Putin called Navalny's demise "sad" and said he had been ready to hand the jailed politician over to the West in a prisoner exchange provided Navalny never return to Russia. Navalny's allies said such talks had been un...