A rival foreign power launched an aggressive cyberattack on the United States, interfering with the 2016 presidential election and leaving every indication that it’s coming back for more — but President Trump doesn’t seem to care.

The unprecedented nature of Russia’s attack is getting lost in the swirling chaos of recent weeks, but it shouldn’t be. American intelligence agencies have concluded that Russia took direct aim at the integrity of American democracy, and yet after almost five months in office, the commander in chief appears unconcerned with that threat to our national security. The only aspect of the Russia story that attracts his attention is the threat it poses to the perceived legitimacy of his electoral win.

If not for the continuing investigation into possible collusion between the Trump campaign and the Russians — and whether Mr. Trump himself has obstructed that investigation — the president’s indifference would be front-page news.

So let’s take a moment to recall the sheer scope and audacity of the Russian efforts.

Under direct orders from President Vladimir Putin, hackers connected to Russian military intelligence broke into the email accounts of senior officials at the Democratic National Committee and of Hillary Clinton’s campaign manager, John Podesta. They passed tens of thousands of emails to the website WikiLeaks, which posted them throughout the last months of the campaign in an attempt to damage the Clinton campaign.