BEIJING  — While a Huawei executive faces possible U.S. charges over trade with Iran, the Chinese tech giant’s ambition to be a leader in next-generation telecoms is colliding with Security Worries abroad.

Australia and New Zealand have barred Huawei Technologies Ltd. as a supplier for fifth-generation networks. They joined the United States and Taiwan, which limit use of technology from the biggest global supplier of network switching gear. Last week, Japan’s cybersecurity agency said Huawei and other vendors deemed risky will be off-limits for government purchases.

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