SEOUL (REUTERS) - South Korea's Lotte Group will continue to invest in its China business despite diplomatic tensions over the deployment of a US missile defence system, a Lotte executive said on Monday (April 3), denying rumours that it wants to scale back its China operations.

Chinese authorities last month closed dozens of Lotte retail stores following inspections, ramping up pressure on South Korea's fifth-largest family-run conglomerate after it agreed to provide land for the US Terminal High Altitude Area Defence (Thaad) missile system outside Seoul.

South Korea and its ally the United States say the system is designed to thwart nuclear-armed North Korea's missile threat, but Beijing says its radar can also reach far into China. Chinese state media have called for a boycott of Lotte businesses in response to the Thaad deployment.

"Currently we plan to continue to invest in our China business and continue to strengthen the business," top executive Hwang Kag Gyu told reporters.

Hwang is the head of Lotte Corporate Innovation Office and is viewed as the second-highest executive next to Chairman Shin Dong Bin. "It's been 20 years since Lotte entered the China market ... we believe the China business is still in an investment period," he said.

South Korean media including wire service Yonhap have raised the possibility of Lotte scaling back its China business in the wake of the backlash against the company there.

Out of 99 Lotte hypermarkets in China, 75 had been closed by Chinese authorities as of April 2, a Lotte Mart spokesman said.

Hwang said Lotte was working to fix problems at the hypermarkets that were raised by Chinese regulators in the wake of the missile deployment.

China is Lotte's biggest overseas market and generated more than three trillion won (S$3.75 billion) in annual revenue in 2015. It is also one of four strategic markets along with Vietnam, Russia and Indonesia that Lotte has been focusing on, as retail growth in its home market slows.

Hwang said the planned initial public offering of Hotel Lotte would depend on its key duty-free business recovering from the "Thaad effect". What had been a US$4.5 billion (S$6.3 billion) IPO was shelved last year.

"We do not know 100 per cent what their (Chinese authorities') intentions are, so concerning future developments, all we can do is watch," he said.