If anyone gets a thank-you note from President Biden for helping get him out of a jam in recent days, it should probably be former President Donald J. Trump.

Just when Mr. Biden was swamped by unwelcome questions about his age, his predecessor and challenger stepped in, rescuing him with an ill-timed diatribe vowing to “encourage” Russia to attack NATO allies that do not spend enough on their militaries.

The stunner from Mr. Trump over the weekend not only drew attention away from the president’s memory problems, as detailed in a special counsel report, but also provided a convenient way for Mr. Biden’s defenders to reframe the issue: Yes, they could now say, the incumbent may be an old man who sometimes forgets things, but his challenger is both aging and dangerously reckless.

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