Despite offering no solid proof to the public about alleged Russian hacking related to the presidential election, President Obama imposed sanctions on Russia Thursday.

The U.S. Treasury Department announced the sanctioning of several Russian individuals and entities, including the country’s primary security services, known as the FSB, and its main intelligence directorate, according to Politico.

Left hanging will be Trump, who has made clear he is unhappy with Obama voicing opposition to Russia while the transition is underway.

The Treasury document also states the U.S. will sanction a 29-year-old Latvian who lives in Krasnodar near the Black Sea.

But missing from the executive action is proof made available to the public.

Even leaks to the media that assert the CIA believes Russia interfered in the election have not been verified by President Obama. Instead, the public has been left to believe general charges and sometimes cryptic accusations that Russian President Vladimir Putin and Russian intelligence agents deliberately hacked into the Democratic National Committee and Hillary Clinton’s campaign chairman’s Gmail account to find documents later leaked to WikiLeaks.

The ostensible goal was to aid Republican Donald Trump, now the president-elect. Trump has said he doubts Russia was behind the hacks.

The Hill reported earlier on Thursday that the president is under “tremendous pressure” to go public with proof.

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Obama wants intelligence agencies to come up with a report that he can release to the public before Jan. 20, when President-Elect Donald Trump takes office.

Some officials have told Obama not to release information. The Hill reports officials have warned that the document will contain “highly sensitive and classified information.”

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Left hanging will be Trump, who has made clear he is unhappy with Obama voicing opposition to Russia while the transition is underway. Trump wants more normalized relations with Russia.

Trump also seems to resent Democratic claims his victory was tainted by Russian hacking.

The issue of alleged Russian hacking was well-aired by Clinton and Obama, long before voters went to the polls on Nov. 8.