Kyiv officials said Moscow planned to step up its informational war this spring, spreading disinformation in an attempt to divide Ukrainian society in the third year of its invasion.
The Kremlin has denied state involvement in his death and has said it is unaware of any agreement to free Navalny prior to his death.
In a statement published on its website, the Federal Penitentiary Service said that Navalny "felt unwell" after a walk on Friday, and "almost immediately lost consciousness."
Putin, 71, who has chosen to run as an independent rather than as the candidate of the ruling United Russia party and who has been Russia's paramount leader since 2000.
The European Union's top court on Wednesday upheld sanctions against Russian billionaire Roman Abramovich that had been placed upon him after Russia's invasion of Ukraine.
Russia's Naval Aviation has been particularly diligent in its maritime air patrol operations recently, according to the British Defense Ministry.
Putin, who was handed the presidency by Boris Yeltsin on the last day of 1999, has been leader for longer than any other Russian ruler since Josef Stalin.
Yaroslav Hunka, 98, received two standing ovations from Canadian lawmakers. Hunka served in World War Two as a member of the 14th Waffen Grenadier Division of the SS.
In a call with reporters, Kremlin spokesman Dmitry said that Russia's investigation took into account the possibility that the crash had been caused deliberately.
"We all know that the Kremlin has a long history of killing opponents," said White House press secretary Karine Jean-Pierre. "It's very clear what happened here."