common practice: use "ref" tag for ref in Cyrillic.
closed according to several sources (maps.aopa.ru, ourairports, ...)
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned
removed iata code: it is no longer assigned