The appeal came ahead of a Monday meeting of the Chapter of the Order of the White Eagle, convened partly to consider Nawrocki's proposal to strip Zelensky of Poland's highest state honour.
The dispute was triggered in late May when Zelensky named a special forces unit after the "Heroes of the UPA" – the Ukrainian Insurgent Army, associated with wartime massacres of Poles in the Volhynia and Eastern Galicia regions of what was then German-occupied Poland.
The Ukrainian president's decision drew sharp criticism across the Polish political spectrum.
Nawrocki condemned the move, warning it had handed "plenty of oxygen for Russian propaganda".
Zelensky received the Order of the White Eagle in April 2023, awarded by then-President Andrzej Duda for his contribution to Polish-Ukrainian relations and the defence of democracy and peace in Europe.
Writing on X, Tusk said diplomacy had so far yielded no results and called for a "direct and frank conversation" between the two presidents.
"Cooperation lies in the interest of both our states and nations, while conflict lies in the interest of Moscow," he added.
His intervention drew a sharp response from Marcin Przydacz, head of the presidential International Policy Bureau, who accused the prime minister of admitting his own "complete powerlessness" and casting doubt on the foreign minister's performance.
Amid the tensions, Kyrylo Budanov, head of the Ukrainian presidential office, visited Warsaw on Friday and Saturday for talks with senior Polish government and presidential officials.
(ał)
Source: PAP