By Xiuhao Chen and Liz Lee

BEIJING, March 23 (Reuters) - China has urged all parties involved in the Middle East conflict, particularly the U.S. and Israel, to cease military operations, warning of a "vicious cycle" in a war that analysts say if prolonged, could undermine global growth and weaken demand for Chinese exports.

"The one who tied the bell must be the one to untie it," said Chinese special envoy to the Middle East Zhai Jun at a briefing after his shuttle-diplomacy trip that included stops in Saudi Arabia, the United Arab Emirates and Kuwait.

China will maintain close communication with all parties concerned and make unremitting efforts to ease tensions and promote regional peace and stability, he said.

In a separate briefing, foreign ministry spokesperson Lin Jian cautioned that the use of force would only lead to a "vicious cycle" and that the war should not have been started.

"Should the hostilities continue to spread and intensify, the entire region will be plunged into chaos," he said.

Trump on Saturday imposed a 48-hour deadline on Tehran to reopen the Strait of Hormuz to all shipping, threatening to destroy Iranian power plants otherwise.

Iranian ​attacks have effectively closed the key waterway which carries a fifth of global oil and liquefied natural gas, causing the worst oil crisis since the 1970s.

CHINA'S EXPORTS

While Beijing did not detail its concerns, a prolonged conflict could weigh on China's export outlook.

Emerging markets-key drivers of Chinese export growth-are particularly vulnerable due to limited oil reserves and sensitivity to rising energy costs.

"Weakening growth in China's emerging market trading partners will likely weigh on Chinese exports to these countries in the coming quarters," Goldman Sachs's Hui Shan said in a report about the current near-term risks to China's economy.

China is relatively better positioned to absorb higher oil prices with coal accounting for about 60% of its energy mix, ample oil stockpiles and imports via the Strait of Hormuz, representing only around 5% of total energy consumption.

Still, rising oil and gas prices could lift inflation and end producer price deflation, according to the chief China economist.

The bank has cut its forecast for China's second-quarter growth and raised its inflation outlook for 2026.

Asked whether China had pressed Iran to ensure safe passage for Chinese vessels and oil shipments through the strait, Lin said Beijing remains in communication with all parties and is committed to easing tensions.

(Reporting by Xiuhao Chen and Liz Lee; Additional reporting by Samuel Shen; Additional writing by Jessie Pang; Editing by Jacqueline Wong and Arun Koyyur)