He was speaking during a visit to Bern after talks with Swiss President Guy Parmelin and members of the governing Federal Council.
Nawrocki, who is on a two-day visit to Switzerland with his wife Marta, said security issues featured prominently in the discussions alongside political, economic and technological cooperation.
"Russia will remain the main threat to European security, also after the end of the war in Ukraine," Nawrocki told reporters after his talks with Parmelin.
He said he and Parmelin had also discussed tightening sanctions on Russia, arguing that the measures were having an increasing impact on the Russian economy.
"We see that sanctions are bringing the expected results and that the Russian economy is increasingly feeling their impact," Nawrocki said.
"We should therefore continue these efforts in order to make it as difficult as possible for Russia to finance its military activities," he added.
Nawrocki said the ultimate goal was "a lasting and just peace."
He described Polish-Swiss relations as friendly and based on "regular dialogue in political, economic and cultural affairs," while inviting Swiss investors to expand their presence in Poland.
The Polish president said a significant part of the talks focused on the Three Seas Initiative, a Polish-led regional cooperation platform bringing together 13 countries in Central and Eastern Europe.
"Poland is effectively the engine and heart of the Three Seas Initiative together with Croatia," Nawrocki said, adding that he hoped Switzerland would become a strategic partner of the project in areas such as technology and investment.
The leaders also discussed cybersecurity, technological cooperation and Swiss development funds supporting projects in Polish cities, Polish state news agency PAP reported.
Nawrocki said the talks also touched on Poland's bid to join the G20 group of the world's largest economies and Switzerland's cooperation with the European Union.
On Thursday, Nawrocki is due to attend a working breakfast with business leaders, visit the École Polytechnique Fédérale de Lausanne, a leading Swiss university renowned for its contributions to science and technology, and tour the Paderewski Museum at Morges Castle on the shores of Lake Geneva, an institution focusing on the legacy of Polish pianist, composer and statesman Ignacy Jan Paderewski.
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Source: IAR, PAP, prezydent.pl