Balkan Love Story: Act I Scene II

It sounds a bit like a Balkan soap-opera: Some view the recent statements and actions of Montenegrin politicians towards Croatia to be "sychopantic". Meanwhile; like many a great soap-operas, this "love"; according to one commentator, is an "unrequited" one.

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A few questions; that are perhaps too generic and broad to receive a proper answer:
(But I'll throw them out anyways)

1. The article alludes to the economic rationale behind Montenegro's new "relationship" (for lack of a better term) with Croatia; and some economic benefits to Montenegro. What benefits are there for Croatia?

2. The article also alludes to the relationship between Montenegro and Serbia. In a nutshell, what is the relationship like between Montenegro and Serbia; on both a state-state level; and general public opinion?
(and I realize this is an unbelievably broad question; with perhaps many exceptions and nuances)

Croatia Shelves Demand for War Damages from Montenegro

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This week’s ICJ judgment in the genocide suit that Bosnia and Herzegovina brought against Serbia is seen as a warning that the judicial route to compensation is unlikely to produce results.

On February 26, the court largely exonerated Serbia of responsibility for wartime genocidal acts in Bosnia and Herzegovina, ruining Sarajevo’s hopes of securing reparations from Belgrade.

Luka Brkic, a professor of international economic relations at Zagreb University, told Balkan Insight that the verdict had important implications for Croatia’s international lawsuits.

“Croatia won’t get a judgment [against Serbia at the ICJ], which would be the grounds for getting reparations out of Serbia,” he predicted.