He’s still a little goofy, and the doddering old man moments still make us all a little uncomfortable, but on the subject of Russia’s out-of-control aggression, President Biden came off last week as a strong and capable leader.

At a news conference addressing the death of Russian opposition leader Alexei Navalny, Biden took on all comers: the bully president in Moscow, the shameless Congress in Washington and the troublemaking candidate who wants to push him out of the White House.

“Make no mistake — Putin is responsible for Navalny’s death,” Biden said Friday, mincing no words about his disdain for the Russian leader.

“We don’t know exactly what happened. But there is no doubt that the death of Navalny was a consequence of something that Putin and his thugs did.”

After months of “Saturday Night Live” skits, late-night monologue jokes and a scathing Justice Department report about the........

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