Trump declared in a series of tweets yesterday that "only 'stupid' people or fools" would come to a different conclusion.
"Having a good relationship with Russia is a good thing, not a bad thing," he stated from Trump Tower, adding: "We have enough problems without yet another one."
American intelligence officials on Friday briefed the president-elect on their conclusions that the Kremlin interfered in the 2016 election in order to help him win the White House.
Trump has repeatedly sought to downplay the allegations, alarming some who see a pattern of skepticism directed at US intelligence agencies and a willingness to embrace Putin.
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There has been no official comment from Moscow on the report, which was released as Russia observed Orthodox Christmas.
But Alexei Pushkov, an influential member of the upper house of parliament, said on Twitter that "all the accusations against Russia are based on 'confidence' and suppositions. The USA in the same way was confident about (Iraqi leader Saddam) Hussein having weapons of mass destruction."
During the election, Trump praised the Russian strongman as a decisive leader, and argued that the two countries would benefit from a better working relationship though attempts by the Obama administration at a "Russian reset" have proved unsuccessful.
At the same time, intelligence officials believe that Russia isn't done intruding in US politics and policymaking. Immediately after the November 8 election, Russia began a "spear-phishing" campaign to try to trick people into revealing their email passwords, targeting US government employees and think tanks that specialise in national security, defense and foreign policy, the unclassified version of the report said.
The website's founder, Julian Assange, has denied that it got the emails it released from the Russian government. The report noted that the emails could have been passed through middlemen.