Ukrainian President Volodymyr Zelenskyy has accused Russian leader Vladimir Putin of the murder of Russian opposition leader Alexei Navalny.

"Obviously, Navalny was killed by Putin, like so many thousands of others. Putin doesn't care who dies and seeks to maintain his position," the Ukrainian leader said at the joint press conference with German Chancellor Olaf Scholz in Berlin.

"Putin has to be held accountable," Zelenskyy added.