WASHINGTON — With the long history of battles for democracy in Europe shadowing him, President Obama on Monday embarks on a week-long trip to Poland, Belgium and France that he hopes will convince the world that the U.S. remains a bulwark defender of democratic government at the same time it closes the book on more than a decade of war.

The trip, which begins with a visit to Warsaw on the 25th anniversary of Poland’s first democratic elections and concludes with events in Normandy marking the 70th anniversary of D-Day, comes just days after Obama unveiled a new vision for American foreign policy at the U.S. Military Academy.

The president’s argument that the U.S. can strike an effective balance between global leadership and “foreign entanglements” will be immediately tested by a European public skeptical that the country will do what is necessary to rebuff the encroachments of Vladimir Putin’s Russia into Ukraine and, more broadly, Eastern Europe.

Obama, who would prefer to focus U.S. foreign policy on other threats and opportunities, is being thrust into a role that was played more comfortably by predecessors in the defining years of the Cold War.

His remarks Wednesday in Warsaw, just a few hundred miles from Ukraine and the old borders of the Soviet Union, have the potential to resonate like similar speeches by Ronald Reagan and John F. Kennedy at the Brandenburg Gate decades ago. But some Europeans are not certain that Obama will embrace that mantle.

“The European mood has moved from seeing America as doing too much under George W. Bush to America doing too little under Barack Obama,” said Dominique Moisi, co-founder of the French Institute of International Relations.

Moisi added: “I think there is growing skepticism that to confront Putin, America may not be best represented by a lawyer with a great intellect but who is maybe not strong enough to face the harsh geopolitics of the moment.”

Senior U.S. officials, however, say Obama will make absolutely clear that he remains firmly committed to the defense of democracy and self-rule in Europe.

Ben Rhodes, deputy national security adviser for strategy communications, said that in Europe, Obama will “have a chance to reaffirm America’s unwavering commitment to secure democracy and to the security of our Eastern Europe allies, recognizing that Poland, as much as any nation, understands that democracy is something that needs to be constantly defended and constantly advanced.”

In Poland, leaders hope that Obama will go beyond rhetoric and commit to an increased military presence in the region to protect the interests of Eastern and Central Europe against Russia.

In response to Russia’s annexation of Crimea, the United States has modestly bolstered its presence in Central Europe, sending several hundred troops on a rotational basis and a group of F-16 fighter jets for joint exercises. But Heather Conley, director of the Europe program at the Center for Strategic and International Studies, said Obama would face pressure to do much more this week.

“They need the physical reassurance,” she said of the Eastern and Central Europeans.

“During the Cold War, the issue wasn’t only deterring the Soviets but reassuring our allies,” said Robert Lieber, a professor of government and international affairs at Georgetown University. “That reassurance is missing right now. And the Europeans feel it palpably.”