Obama, the one doing the welcoming, is himself new to the table. He is taking part in his first NATO summit and seeking support from allied nations toward the plodding effort in Afghanistan, where the new U.S. president is sending in more troops and civilian help.
As the leaders got down to business, the two NATO summit hosts, French President Nicolas Sarkozy and German Chancellor Angela Merkel, made it clear they embraced new U.S. leadership. "We are very pleased to work with him," Sarkozy said of Obama. "We trust him."
Meanwhile, outside, police fired tear gas and flash bombs at protesters throwing Molotov cocktails and rocks less than 2 miles from the gathering of world leaders. First lady Michelle Obama and other spouses canceled a visit to a cancer hospital out of concern for security, the French president's office said.
One of NATO'S stickiest political issues is how and where to grow. Germany, France and many other NATO nations fear any more NATO eastward expansion will further damage the alliance's ties to Russia.
Said Obama: "The door to membership will remain open for other countries that meet NATO standards and can make a meaningful contribution to allied security."
Founded in 1949, NATO has added members since the collapse of the Warsaw Pact, its Soviet-dominated Cold War foe. In contrast to the alliance's previous eastward expansion, which infuriated Russia, Moscow has not objected to the inclusion of Albania and Croatia in NATO.
Albania and Croatia officially joined NATO this week. Obama praised them for having already deployed troops to the NATO-led force in Afghanistan, calling that commitment a sign that both countries will be strong contributors.
"We are proud to have you as allies," Obama said. He also made a pitch for Macedonia and said he looks forward to the day when it will would join the alliance, too. Macedonia's accession to NATO has been stalled over a dispute with Greece.
Earlier, in a move symbolic of NATO's unity, Obama began his Saturday by joining Merkel and other heads of states in walking along a pedestrian bridge that links Germany and France across the Rhine River. The leaders met Sarkozy at the center of the bridge, then crossed together onto the French side in Strasbourg and posed for a group photo.
In the midst of an eight-day trip abroad, Obama says it is a new day in U.S.-European relations. But he is likely to encounter the same old story of allied reluctance to send more troops to Afghanistan.
