Prime Minister Donald Tusk and former President Aleksander Kwaśniewski have also expressed concern ahead of the country's presidential runoff, warning that Nawrocki's position echoes Kremlin narratives.
Nawrocki, a contender backed by the opposition Law and Justice (PiS) party, was expected to meet on Thursday with far-right politician Sławomir Mentzen, who finished third in the first round of Poland's presidential election on May 18.
The ruling Civic Coalition's Rafał Trzaskowski, who won the most votes in the first round, was scheduled for a similar meeting on Mentzen's YouTube channel on Saturday.
Mentzen, whose support could prove decisive in the June 1 two-candidate runoff, has put forward an eight-point declaration he wants both candidates to endorse.
Among the demands is a refusal to support any legislation ratifying Ukraine’s potential NATO membership—a condition Nawrocki has said he is willing to accept.
FM condemns Nawrocki’s stance on Ukraine’s NATO bid
Speaking to public broadcaster Polish Radio on Thursday, Sikorski strongly criticised Nawrocki’s stance on Ukraine’s NATO bid, saying: "If Nawrocki doesn't understand this, he shouldn't be president."
Sikorski told Polish Radio that past Polish presidents from Nawrocki’s own political camp had firmly backed Ukraine's Euro-Atlantic aspirations.
“With Lech Kaczyński, shoulder to shoulder, we fought at the NATO summit in Bucharest for a membership plan for Ukraine," Sikorski said. "And with President Duda in Washington, we pushed for the strongest possible language in support of Ukraine’s future in NATO and the European Union. I don’t see that same enthusiasm here."
'This is mortally dangerous for Poland': PM
Polish Prime Minister Donald Tusk also weighed in, criticising Nawrocki’s willingness to sign Mentzen’s declaration - which includes opposition to Ukraine’s NATO membership - as aligning with key Kremlin demands.
“The first and most important of Putin’s demands towards Ukraine and the West is a ban on Ukraine joining NATO," Tusk wrote on X.
"Nawrocki has just eagerly signed up to that demand," he added. "The next will be Ukraine’s capitulation and division. He’ll sign that too. This is mortally dangerous for Poland."
Polish ex-president backs Ukraine’s NATO bid
Former Polish President Aleksander Kwaśniewski criticised efforts by Mentzen to influence the second round of the presidential election by proposing an eight-point pledge that includes opposing Ukraine’s NATO membership.
Speaking to broadcaster Radio ZET, Kwaśniewski dismissed the idea of candidates signing declarations from a "first-round dropout" as “a misunderstanding.”
While acknowledging that Ukraine’s NATO accession is unlikely under the current US administration, he stressed it remains in Poland’s strategic interest.
"Ukraine’s entry would move NATO’s border 1,000 kilometres east and bring in the most battle-hardened army in Europe,” Kwaśniewski said.
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Source: PR1/PAP/X/@donaldtusk/@RadiowaJedynka/@Gosc_RadiaZET
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