Speaking at a joint news conference ahead of the July 7-8 summit in Ankara, Sikorski and Defence Minister Władysław Kosiniak-Kamysz said Poland would present a united position alongside President Karol Nawrocki.
Sikorski said the Polish government had approved its official position for the summit and submitted it to the president.
"The nation expects that on matters of security, all political forces ... speak and act with one voice, and that is exactly what is happening," he said.
He said the summit's main objective would be to send a clear signal of allied cohesion to Moscow.
"Russia is waging hybrid warfare. It is conducting cognitive warfare. It is trying to divide us among ourselves, divide allies and drive a wedge between us and Ukraine," Sikorski said. "We will show that the alliance is not only united but stronger following the accession of Sweden and Finland."
Sikorski said it would be "great recklessness and madness" for Putin to attempt to test NATO's unity through any provocative action.
He added that Poland hoped the summit would confirm that most allies were on track to meet previously agreed defence spending commitments, strengthening the alliance's deterrence.
Kosiniak-Kamysz also described the meeting as an opportunity to demonstrate NATO unity and said Poland had earned a leading role within the alliance by meeting its defence commitments.
"We meet all the criteria of a loyal, exemplary and reliable ally," he said, saying that Poland has already reached NATO's target of spending 5 percent of gross domestic product on defence and security.
He added that Poland's overall security-related spending could reach between 6 percent and 7 percent of GDP.
Kosiniak-Kamysz said key topics at the summit would include expanding the defence industry, increasing Europe's production capacity for air defence missiles and strengthening cooperation on drones, counter-drone systems, long-range strike capabilities and artificial intelligence.
He said Poland was particularly interested in transferring some production of air defence missiles from the United States to Europe, especially for the MIM-104 Patriot system, as US manufacturing capacity struggles to keep pace with demand.
The NATO summit will be held in Ankara on July 7-8, with Poland represented by President Karol Nawrocki, accompanied by senior government officials, including Sikorski and Kosiniak-Kamysz.