Tusk said the drills were designed to prepare the coalition to deliver "real security guarantees" for Ukraine and the wider region.
He confirmed Polish forces would take part too, describing Warsaw as the exercises' full host rather than merely a participant.
The prime minister also said Poland was working on the logistics and funding for a possible permanent presence of American troops, as well as other allied forces.
On Monday, leaders from around 35 countries gathered in Paris for the coalition talks, including French President Emmanuel Macron, Ukrainian President Volodymyr Zelensky and NATO Secretary-General Mark Rutte.
Nine European nations – Denmark, France, Germany, Italy, Norway, Spain, Sweden, the UK and the Netherlands – separately agreed with Ukraine to launch an industrial partnership aimed at building up European defences against ballistic missiles.
Asked why Poland was not among them, Tusk said the scheme was industry-led and that Polish firms were still assessing what they could contribute; Warsaw would join once a formal offer was ready.
Tusk also confirmed Poland has no current plans to send Patriot missiles to Ukraine, but insisted Warsaw would keep supporting Kyiv "as far as our capabilities allow, without compromising our own security."
On the prospects for peace or a ceasefire, Tusk was pessimistic, pointing to what he called Russia's rigid stance under President Vladimir Putin.
The Polish PM said he expected Moscow to escalate rather than negotiate, possibly prolonging the war at least until winter – a view he said was shared by Rutte and Zelensky.
Coalition leaders were also due to mark Bastille Day in Paris on Tuesday, with a Polish military contingent and two F-16 jets taking part in the parade, themed this year around Europe's "strategic awakening."
The coalition of the willing first convened in January 2025 and now includes over 35 countries, mostly European, alongside Canada, Japan and Turkey.
On Monday, Moldova and North Macedonia officially joined the group.
(ał)
Source: PAP