It has emerged that US vendor Motorola, which earlier this week agreed the sale of its networks unit to rival Nokia Siemens Networks, has sued Chinese firm Huawei over the alleged theft of trade secrets. The legal action follows a suit from 2008 in which Motorola sued five former employees for sharing information with IP networking firm Lemko, headquartered like Motorola in Schaumberg, Illinois. Lemko has a reseller agreement with Huawei.