"We no longer have time for discussions," Duda said in his letter, as cited by the Euronews website. "We need decisions. We must act now."
In the message sent on Wednesday, the Polish president marked the country's 26th year as a member of the alliance by calling on the leaders of all member states to expand their armies and support NATO at the upcoming summit in the Netherlands, Euronews reported.
The Polish president last week formally requested that NATO leaders discuss raising defence spending to 3 percent of GDP at the alliance's June summit in the Hague.
Speaking alongside NATO Secretary-General Mark Rutte during a visit to Brussels, Duda warned that failing to strengthen the alliance’s deterrence capabilities could embolden Russia to expand its aggression beyond Ukraine.
The Polish president, who maintains a good relationship with US leader Donald Trump and his administration, wrote: "There is no strong Europe without the USA and NATO, just as there is no strong NATO without a committed Europe."
Duda added that the United States "was and continues to be the natural leader of the alliance," according to Euronews, while also arguing that the strength of NATO "lies in our unity, our resolve and our readiness to act."
Duda last Friday proposed a constitutional amendment for Poland to spend at least 4 percent of its GDP on defence.
Poland now spends a higher proportion of GDP on defence than any other NATO member, including the United States, data show.
Last year, Poland's defence spending reached 4.1 percent of GDP, according to NATO estimates.
Duda in January signed the country's budget for 2025, which expects defence spending to reach 4.7 percent of GDP this year.
US President Donald Trump last week reiterated doubts about defending NATO allies who fail to meet defence spending goals, telling reporters in the Oval Office: "If they don’t pay, I’m not going to defend them."
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Source: PAP, euronews.com