WARSAW, Poland (AP) - Ukrainian President Volodymyr Zelenskyy met with Polish Prime Minister Donald Tusk on Monday and discussed Russia's continuing attacks on Ukraine and further support from NATO on the eve of a summit marking the Western defense alliance's 75th anniversary.

Zelenskyy stopped in Warsaw en route to the NATO summit in Washington, which is expected to discuss ways of providing reliable long-term security aid and military training for Ukraine more than two years after Russia's invasion.

The talks came hours after Russian missiles killed at least 20 people in attacks on various sites in Ukraine, including a children´s hospital in the capital.

At the NATO summit Poland will be represented by President Andrzej Duda, who was scheduled to meet with Zelenskyy later Monday. Poland is among the staunchest supporters of Ukraine and has offered some $4 billion in military equipment, training and other items for defense. It is also offering humanitarian, political and economic support.

An initiative likely to be endorsed at the three-day summit is NATO taking more responsibility for coordinating training and military and financial assistance for Ukraine´s forces, instead of the U.S. Europeans also are talking about giving Ukrainians a greater presence within NATO bodies, though there´s no consensus yet on Ukraine joining the alliance.