President Barack Obama sanctioned Russian officials and entities on Thursday in response to Moscows reported hacking during the U.S. presidential election.

All Americans should be alarmed by Russias actions , the president said in a statement.

In addition to hitting two Russian intelligence agencies, three companies and four individual intelligence officers with sanctions banning them from travel and business with U.S. companies or individuals, Obama ordered 35 Russian operatives posted at diplomatic facilities in Washington and San Francisco to leave. The president asked the State Department to bar Russians from entering two Russian-owned compounds in Maryland and New York that were used to gather intelligence, according to his statement. And Obamas Treasury Department barred U.S. business with two Russians accused of cyber-theft of money and data.

Obama left the door open for further action, including a potential cyberattack on Russia. We will continue to take a variety of actions at a time and place of our choosing, some of which will not be publicized, he stated.

If Russia is not deterred now, the Obama administration believes it will continue to interfere in U.S. elections, as well as elections in U.S.-friendly countries, officials told reporters in a call. One official described Russian government actions against U.S. diplomats posted in Russia as part of the countrys flagrant violation of diplomatic norms.

Obamas successor, president-elect Donald Trump , has cast doubt on the U.S. intelligence communitys pre-election declaration that Russia was responsible for unearthing and releasing Democratic National Committee communications damaging to Trumps opponent, former Secretary of State Hillary Clinton .

Following Trumps victory, leaks to The Washington Post revealed that many intelligence officials including the leaders of the FBI and the CIA believe Russian President Vladimir Putin authorized the hacks to aid Trump, who has previously praised the Russian leader. On Wednesday, Trump said it was time to move on and repeated that he believes its impossible to know who targeted Clinton.

In a statement Thursday, the president-elect said he would meet with intelligence officials next week to discuss the issue, but said he still wanted the matter to be left in the past.

Its time for our country to move on to bigger and better things, Trump said Thursday.

But Obama appears committed to proving Russias responsibility despite the denials from Trump and the Kremlin . His administration wants Congress to receive intelligence reports that lay out the evidence before Trump enters office and is able to call off such investigations.

I would never expect Russia to come out with their hands up and acknowledge they did it, an official said on the Thursday call. They still deny that they are intervening in eastern Ukraine.

The Department of Homeland Security and the FBI tried to bolster their case to the public on Thursday by releasing a 13-page joint report providing some details of what the agencies know about the Russian actions.

The report cites technical indicators that the hacking was tied to Russian civilian and military intelligence services. It adds that in some cases, the Russian actors masqueraded as third parties, hiding behind false online personas designed to cause the victim to misattribute the source of the attack.

Actors likely associated with Russian civilian and military intelligence services are continuing to engage in spearphishing campaigns, and launched one attack just days after the U.S. election, the report stated.

The government also released a list of IP addresses associated with the alleged Russian activity, including addresses based in the U.S., Mexico, Puerto Rico, Germany, Vietnam, Canada, Thailand, South Korea, Spain, China, Denmark, the U.K., Luxembourg and Russia.

The report does not go into detail about how the U.S. determined that the Russian government was involved. But senior U.S. officials said there was no debate within the intelligence community that Russia interfered in the election. This wasnt a he-said-she-said situation, one official said. Instead, the official added, there are facts, and then theres what Russia said.

Officials said they plan to release another public report with more details on the findings before Obama leaves office.

The independent cybersecurity firm Crowdstrike has conducted its own analysis and concluded that the Russian military intelligence agency now under sanctions, the GRU, was behind the attack on the Democratic National Committee.

The Intercept reported Thursday morning that the National Security Agency has successfully tracked Russian hacking in the past; its capabilities may be the key to the intelligence communitys confidence in Russias meddling.

These data theft and disclosure activities could only have been directed by the highest levels of the Russian government, Obama said on Thursday. Moreover, our diplomats have experienced an unacceptable level of harassment in Moscow by Russian security services and police over the last year. Such activities have consequences.

Putins spokespeople attacked the Obama team in personal terms, calling them losers and promising retaliation .