Starbucks workers at 65 unionised US stores have gone on strike in their latest bid to pressure the coffee chain for better pay and staffing after negotiations stalled. The union, Starbucks Workers United, is also pushing the company to resolve hundreds of unfair labour practice charges. Talks for a contract agreement broke down in the spring, and the two sides remain at odds over key economic issues. Starbucks said the strike on Thursday will affect fewer than 1% of its thousands of shops,