/resources/geo_target_constant.proto 

--- v25/resources/geo_target_constant.proto 2026-10-26 16:32:22.000000000 +0000
+++ v26/resources/geo_target_constant.proto 2026-10-26 16:32:27.000000000 +0000
@@ -82,4 +82,9 @@
       type: "googleads.googleapis.com/GeoTargetConstant"
     }
   ];
+
+  // Output only. Indicates whether changing targeting of this geo requires
+  // setting Campaign.contains_eu_political_advertising field.
+  optional bool require_eu_political_advertising_declaration = 15
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 }