Ukraine said on May 18 that two Russian servicemen captured in the country's eastern conflict zone would be prosecuted for "terrorist acts", a move that will likely worsen the already strained relationships between countries.
Russia's War Against Ukraine
Mashable: Ukraine to prosecute captured ‘Russian soldiers’ for ‘terrorist’ acts

A Ukrainian officer shows a special nine-millimetre calibre rifle, seized from captured Russian servicemen during a press conference in the Ministry of Defence of Ukraine in Kiev on May 18.