WARSAW — Frustrated by the United Nations’ passive response to Russian aggression in Ukraine, President Bronislaw Komorowski of Poland has said he intends to call on the organization to change its rules to prevent Moscow from vetoing Security Council actions on the region.

“My main message will be that perhaps the United Nations should be reformed to make the institution capable of addressing the threats that really exist today,” Mr. Komorowski said in an interview this week at the presidential palace here in advance of his visit to the United Nations in New York next week. “I think blocking the Security Council on Ukraine is a token, a symptom, of the general weakness of the U.N.”

Like the other permanent members of the United Nations Security Council — Britain, China, France and the United States — Russia has the power to veto any of the Council’s actions. But actually removing Russia’s veto on the Council is nearly impossible. Under Article 108 of the organization’s charter, removing the right to veto would require both a vote of two-thirds of the General Assembly and ratification by whatever constitutional process is in place in two-thirds of the member nations, including all five permanent Council members.

In other words, Russia has a veto over removing its own veto.

Still, Mr. Komorowski’s call is a sign of Poland’s unease over the international response to the Ukraine conflict and the country’s growing confidence and rising profile in European and trans-Atlantic affairs.