Iran keeps close tabs on its citizens, aided by imported technology, and faces rising Western sanctions over its nuclear program and the treatment of its people since the state crushed protests over a contested 2009 vote. Huawei will "voluntarily restrict its business development" in Iran "by no longer seeking new customers and limiting its business activities with existing customers", the Shenzhen-based company said on its website. "For communications networks that have been delivered or are under delivery to customers, Huawei will continue to provide necessary services to ensure communications for Iran's citizens," the statement said.