Speaking at a debate on Catalonia at the University of Copenhagen, Puigdemont said: "We will not surrender to authoritarianism despite Madrid's threats."
"Soon we will form a new government... it's time to end their oppression and find a political solution for Catalonia," the 55-year-old politician added.
Puigdemont's comments came hours after the speaker of the Catalan parliament proposed him as president of Catalonia following an election in December in which separatist parties once again won an absolute majority.
Newly elected Catalan regional parliament speaker Roger Torrent arrives for a press briefing to announce his candidate for the regional presidency. Photo: AFP
Roger Torrent said Puigdemont's candidacy to once again head Catalonia's regional government is "absolutely legitimate", even though the secessionist leader faces criminal proceedings in Spain over his role in Catalonia's independence drive.
Puigdemont defied Spanish prosecutors' attempt to re-issue a European arrest warrant if he left Belgium, where he has been in exile since a failed independence bid.
Puigdemont arrived in Copenhagen on Monday morning. Photo: Tariq Mikkel Khan/Scanpix Denmark
But Supreme Court Judge Pablo Llarena turned down the request, arguing Puigdemont had gone to Denmark "to provoke this arrest abroad" as part of a strategy to boost his arguments in favour of being allowed to be sworn in as president of Catalonia again.
Puigdemont wants to be sworn in from Belgium, where he fled in late October after the Catalan parliament declared unilateral independence, sparking shock waves across an EU already shaken by Britain's vote to leave.
Madrid sacked Puigdemont and his entire government, and it dissolved the parliament following the declaration.
Charged with rebellion, sedition and misuse of public funds, Puigdemont now faces arrest if he returns to Spain over his role in the independence drive.
"Fundamental freedoms have been undermined, democratically elected politicians have been sent to prison and treated like terrorists," he told students in Copenhagen, describing the moves as acts of "revenge".