A few years ago , barter deals accounted for up to 25-30 percent of Russian exports because " thousands ( of ) trade companies which popped up preferred barter in the absence of reliable Russian banks and money transfer systems " , Volkova said .
<response> A few years ago , barter deals accounted for up to 25-30 percent of <misc>Russian</misc> exports because " thousands ( of ) trade companies which popped up preferred barter in the absence of reliable <misc>Russian</misc> banks and money transfer systems " , <person>Volkova</person> said . </response>