This apparent breach may be the same group of Russian and Ukrainian
  hackers responsible for the data breaches at Target, Sally Beauty
  and P.F. Chang’s, among others.

Interesting how financial and geopolitical motives coincide for these thieves. The batches of stolen credit cards are named "American Sanctions" and "European Sanctions".

By the way, what happened to the supposedly massive state-sponsored breach of JP Morgan Chase from last week? That attack was also linked to Russia, but I can't find any updated stories on it.