Ukraine prosecutor opens criminal case against Russian officials

KIEV (Reuters) - Ukrainian state prosecutors said on Tuesday they had opened a criminal investigation against a Russian law enforcement agency, accusing it of supporting separatist and "terrorist" groups in the east of the country.

The move appeared to be a tit-for-tat response to a criminal case launched on Monday by Russia against "unidentified representatives of Ukraine's senior political and military leadership", National Guard and nationalist organisations, in which it accused them of committing "genocide".