YOKOHAMA-- Carlos Ghosn, chief executive of the Renault-Nissan Alliance, offered a spirited defense of global auto-making partnerships like the French-Japanese tie-up, which has been roiled by the French government's move last month to increase its influence at Renault.

"We are at least a 16-year-old living example of a successful alliance where two companies which are autonomous and independent are working together, developing synergies," Mr. Ghosn said Wednesday.

Mr. Ghosn, who also serves as chief executive of Renault SA and Nissan Motor Co., spoke at a briefing where the Japanese car maker reported a modest increase in net profit during the latest quarter. The company was bolstered by strong sales in North America but was held back by weakness in Japan, Brazil and Russia.

Nissan and Renault have worked together since 1999, when the French company rescued Nissan from near collapse. In April, the French government, which owns a stake in Renault, prevailed in a bid to secure double voting rights for long-term shareholders, over the objections of Mr. Ghosn.

The move has prompted speculation that Nissan might seek to alter the terms of the partnership. Nissan now sells roughly twice as many cars as Renault. But it holds only a 15% nonvoting stake in Renault, which has a 43% voting stake in Nissan.

"Nissan is a more powerful brand than Renault at the moment," said Antonio Ferreira, chief executive of Mimotive, an auto industry consulting firm. "I don't think they will just be spectators."

Saying the French government's move had created a "very sensitive situation," Mr. Ghosn was circumspect in his remarks.

"We're talking about the balance of the alliance, the health of the alliance, so I'm not going to make any comment," he said. "This is much more a Renault issue and Nissan is supporting Renault on this issue."

But Mr. Ghosn said he expected industry consolidation to continue. In addition to their main alliance, Nissan and Renault have a vehicle development partnership with Daimler AG.

A number of auto makers have joined forces to work on new technologies, such as hydrogen fuel-cell propulsion.

Toyota Motor Corp. and Mazda Motor Corp. said Wednesday that they would form a partnership to explore collaboration on a range of technologies. Toyota might offer its plug-in hybrid and fuel-cell technologies in exchange for Mazda's fuel-efficient gasoline and diesel engine technologies, a person with knowledge of the matter said earlier.

Elsewhere in the automotive sector, Fiat Chrysler's Chief Executive Sergio Marchionne has been calling for mergers and further industry consolidation.

Renault and Nissan say their alliance is on track to deliver EUR4.3 billion ($4.8 billion) in savings in 2016, up from EUR3.8 billion in 2014.

But the French government's intervention at Renault has prompted concerns about the politicization of international partnerships, especially when they involve shifting production--and jobs--across borders. Renault-Nissan, for example, has said that it will begin making Nissan Micra cars at a Renault plant in France next year.

Meanwhile, Nissan output in Japan has shrunk to fewer than 900,000 vehicles in 2014 from about 1.5 million in 2009. Mr. Ghosn said Nissan would lift domestic output to more than 1 million vehicles in 2016, taking advantage of the weak yen, which lowers the relative cost of making cars in Japan.

Mr. Ghosn said Nissan would ramp up production of Rogue crossover sport-utility vehicles in Japan to meet growing demand in the U.S. The company said its vehicle sales grew by 9% in the U.S. in the financial year ended March 31, outpacing industry growth of 7%.

That helped Nissan post an 18% increase in net profit for the year, to Yen458 billion. Growth slowed somewhat in the latest quarter, when net profit rose by only 3.3%, to Yen118.8 billion, in line with an average forecast of Yen119 billion from analysts surveyed by FactSet. Quarterly sales rose 2.6% from a year earlier to Yen3.29 trillion.

Nissan forecast a net profit of Yen485 billion in the current fiscal year.

Mr. Ghosn said the industry was facing "headwinds" in Nissan's domestic market, where the economy remains sluggish following an increase in the consumption tax last year, as well as Brazil and Russia. In Russia, he said, overall vehicle sales are expected to fall by more than 30% this year, though Nissan expects a slightly smaller decline.

Yoko Kubota contributed to this article.

Write to Eric Pfanner at eric.pfanner@wsj.com

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