Toyako, Japan — President Bush and President Medvedev of Russia said they will keep working jointly to block Iran’s uranium enrichment efforts while indicating they made no progress on bridging differences over American plans to deploy a missile defense system in Europe.

“While there are some areas of disagreement I know there are other areas where we can work together,” Mr. Bush said following his meeting with the Russian leader at the Group of Eight industrial nations summit in Toyako, Japan.

Mr. Medvedev said he and Mr. Bush will “build on the relationship” between the two nations in the remaining months of the American president’s term.

The meeting, which lasted more than an hour, was the first between the two since Mr. Medvedev took over from Vladimir Putin in May. They met previously when Mr. Bush traveled to Russia in April for talks with Mr. Putin on America plans to install a missile-defense system in Eastern Europe.

Relations between the two countries have strained over the anti-missile system and expansion of the North Atlantic Treaty Organization to include former Soviet bloc nations.

Mr. Medvedev, like Mr. Putin, opposes American plans to build a missile-defense system in the Czech Republic and Poland, saying it would threaten Russia. Mr. Bush says it is intended to defend against a missile attack by a “rogue” nation such as Iran.

Mr. Medvedev, Mr. Putin’s handpicked successor, has avoided the former president’s aggressive tone since his May 7 inauguration and is looking to repair frayed relations with Western governments at his inaugural G-8 meeting. Still, he has echoed Mr. Putin’s objections to the anti-missile system.

Mr. Medvedev’s foreign policy adviser, Sergei Prikhodko, said afterward that while consultations on the missile defense plan are continuing, “There is no real progress.”

Both men mentioned Iran as an area of common interest where they would continue cooperating, though they gave no details. America and Russia also are part of the six-party negotiating the dismantling of North Korea’s nuclear program.

“We had a good discussion about Iran,” Mr. Bush, 62, said.

The two nations have a general agreement on their approach on Iran, Mr. Medvedev, 42, said through a translator. “Then certainly there are others with respect to European affairs and this missile defense where we have differences,” he said.