SEOUL—Hyundai Motor Co.'s second-quarter net profit fell by more than a fifth, hurt by weak sales in China and the U.S., its two biggest markets, and by currency weakness in Russia and emerging markets.

Hyundai's sales in China slumped 8.5% in the first half of the year, hamstrung by a lack of new models. It was the latest foreign car maker to report slowing demand in the world's largest vehicle market.

In the U.S., the South Korean auto maker had to offer more incentives to buttress declining sales of sedans, which have become less appealing to consumers who favor larger sport-utility vehicles and trucks.

The world's fifth-biggest auto maker by sales when combined with affiliate Kia Motors Corp. said April-June net profit was 1.79 trillion won ($1.54 billion), down 24% from 2.35 trillion won a year earlier. The result was in line with market expectations for 1.75 trillion won.

Second-quarter operating profit fell 16% to 1.75 trillion won from 2.09 trillion won. Revenue gained 0.3% to 22.82 trillion won from 22.75 trillion won.

The sixth consecutive fall in quarterly net profit comes as Hyundai struggles to compete with Japanese rivals like Toyota Motor Corp. that are reaping hefty profits on the back of a weaker yen.

As well, sales from Hyundai's Russian operations were hurt by the weak ruble as the country suffers from lower oil prices.

Yet Hyundai said Thursday that its board had approved a plan to pay its first-ever interim dividend as part of efforts to increase shareholder value. Shareholders registered at the end of June will receive 1,000 won ($0.86) per share, the company said in a regulatory filing.

In late trading the company's shares were up 5% at 137,500 won. The broader market was up 0.1%.

Write to In-Soo Nam at In-Soo.Nam@wsj.com

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