oh now i see region, releasetype param doesn't filter any movies, just alters releaseDate field for specific region, type.

is there any recommanded method for filtering movies which released in specific region?

If you combine region with either release_date.gte and/or release_date.lte it will filter the results by region. If you use either of these filters, do not use any other date filter like the primary_release_date filter.

thanks! i solved this problem using certification country and using certification.gte as order1 certification! thanks for your advise

Indeed, that could be another way. Downside to that is a certification isn’t a required field while release date is. So you might get more data with release date filters.