Ericsson has announced 950 job cuts on top of those already announced as part of its cost-cutting plan.
The jobs will be cut in Sweden and add to cuts planned to save £1.4bn, which includes the loss of 700 UK jobs at a research and development centre in Coventry.
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The work at Ansty Park, near Coventry is being moved offshore to China.
Peter Skyte, Unite national officer for IT and communications, said this will lead to a loss of highly skilled work that is central to future strategic technological development in the UK. "The country's capacity to compete for future R&D work will be diminished."