Kroger is denying Albertsons’ claims that it didn’t do enough to ensure regulatory approval of the companies’ planned supermarket merger. In court papers filed Tuesday in the Delaware Court of Chancery,

Albertsons and Kroger spent over two years and more than $850 million on an unsuccessful effort to merge. The two supermarket giants are now spending additional money fighting over the fallout. Kroger filed a countersuit Tuesday against Albertsons over the bitter end to its planned acquisition of the Boise-based grocery chain.