In court papers filed Tuesday in the Delaware Court of Chancery, Kroger said Albertsons disregarded the companies’ merger agreement and worked secretly with a partner, C&S Wholesalers, to try to force Kroger to divest more stores to C&S.

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Kroger Co. on Tuesday filed a countersuit in its dispute with Albertstons Cos. over a failed $25 billion merger between the two grocery behemoths.