The hopeful news is that, at the rate he is alienating people, the presidency of Donald J. Trump will end soon. He is unfit for the job and he will soon find that he has few allies. There’s only so much chaos and injustice that the American people will tolerate. Until then, the world must endure him in the confidence that the United States will remain a strong nation, despite the failings of its leader.

In his blizzard of ever-more unhinged tweets in the last week, the one most alarming for Ukraine, of course, is this one on July 25: “Ukrainian efforts to sabotage Trump campaign — “quietly working to boost Clinton.” So where is the investigation A.G. @seanhannity”

So he wants Attorney General Jeff Sessions to investigate whether the Ukrainian government interfered in the 2016 campaign to get Hillary Clinton elected? It’s a strange request coming from the man in the Oval Office.

This all goes back to a couple of items: The Aug. 14 , 2016, disclosure that Trump campaign manager, Paul Manafort, received $17 million in payments for work as a political consultant to deposed President Viktor Yanukovych. It was an expertly timed leak to the New York Times involving documents in the possession of the National Anti-Corruption Bureau of Ukraine.

These were suspicious and probably illegal payments to which Manafort finally admitted in June. Unfortunately, Ukraine’s authorities, looking to placate Trump in the White House, said recently they are not investigating the payments.

Trump backers also say their allegations of Ukrainian government interference in the U.S. presidential election are bolstered by meetings that Democratic Party consultant, Ukrainian-American Alexandra Chalupa, had with the Ukrainian Embassy in the United States during the campaign.

Hold on! Ukraine had every reason to hope for Clinton’s victory, considering Trump’s fondness for Russian dictator Vladimir Putin and his waffling on the Russian-annexed Crimean peninsula. Putin had good reasons to hope for a Trump win. And campaigns always do opposition research on each other. But meetings and leaks are a far cry from Russia’s illegal hacking of Democratic National Committee emails and Kremlin-connected oligarchs’ bankrolling of Trump and his family, which appears to be the focus of the special investigation under way by special counsel Robert Mueller.

Trump’s tirade against Ukraine is a warning that should not be ignored. He will return to the topic when convenient and his view that Ukraine helped Clinton is likely to badly color his foreign policy to the nation.

That is why it’s gratifying that the U. S. Congress is making it more difficult for Trump to rescind sanctions against Russia or chart a Kremlin-friendly course. European allies are on board. It’s regrettable that President Petro Poroshenko is squandering Western goodwill by obstructing domestic reforms and harassing critics. But it is gratifying that — no matter who is in charge on Bankova Street or Pennsylvania Avenue — the U.S.-Ukraine relationship remains deep and strong.