Monthly search value in adwords api is much larger then in a Keyword Planner


I am trying to use an adword api to get some keyword statistics. But what I see is that with a same parameters my monthly search volue is about 7 mln searches. While adword keyword planner shows around 400-500. I can provide php code with parameters I am setting. Network settings:

$  networkSetting = new NetworkSetting();         $  networkSetting->setTargetGoogleSearch(true);         $  networkSetting->setTargetSearchNetwork(false);         $  networkSetting->setTargetContentNetwork(false);         $  networkSetting->setTargetPartnerSearchNetwork(false); 

Language is set to Russian following way:

 $  languageParameter = new LanguageSearchParameter();         $  english = new Language();         $  english->setId(1031);         $  languageParameter->setLanguages([$  english]);         $  searchParameters[] = $  languageParameter; 

Location is set to Ukraine:

$  loc = array();         $  location = new location();         $  location->setId(2804); // Ukraine         $  loc[]=$  location;         $  locationTargetParameter = new LocationSearchParameter();         $  locationTargetParameter->setLocations($  loc);         $  searchParameters[] = $  locationTargetParameter; 

What Am I missing?