diff --git a/hwe/compare/turn_state_snapshot.php b/hwe/compare/turn_state_snapshot.php
index 128929c3..831676e4 100644
--- a/hwe/compare/turn_state_snapshot.php
+++ b/hwe/compare/turn_state_snapshot.php
@@ -85,6 +85,36 @@ function comparisonGeneralCooldownSelectors(mixed $value, string $label): array
     return array_values($result);
 }
 
+/** @return list<array{nationId: int, actionName: string}> */
+function comparisonNationCooldownSelectors(mixed $value, string $label): array
+{
+    if ($value === null) {
+        return [];
+    }
+    if (!is_array($value)) {
+        throw new \InvalidArgumentException("{$label} must be an array");
+    }
+    $result = [];
+    foreach ($value as $entry) {
+        if (!is_array($entry)) {
+            throw new \InvalidArgumentException("{$label} entries must be objects");
+        }
+        $nationId = $entry['nationId'] ?? null;
+        $actionName = $entry['actionName'] ?? null;
+        if (!is_int($nationId) || $nationId < 1 || !is_string($actionName) || $actionName === '') {
+            throw new \InvalidArgumentException(
+                "{$label} entries require a positive nationId and non-empty actionName",
+            );
+        }
+        $result["{$nationId}:{$actionName}"] = [
+            'nationId' => $nationId,
+            'actionName' => $actionName,
+        ];
+    }
+    ksort($result, SORT_STRING);
+    return array_values($result);
+}
+
 /** @param array<string, mixed> $row */
 function comparisonPickRow(array $row, array $mapping, array $jsonKeys = []): array
 {
@@ -134,6 +164,10 @@ function comparisonTurnStateSnapshot(array $request): array
         $observe['generalCooldowns'] ?? [],
         'generalCooldowns',
     );
+    $nationCooldownSelectors = comparisonNationCooldownSelectors(
+        $observe['nationCooldowns'] ?? [],
+        'nationCooldowns',
+    );
     if (!is_int($logAfterId) || $logAfterId < 0 || !is_int($messageAfterId) || $messageAfterId < 0) {
         throw new \InvalidArgumentException('logAfterId and messageAfterId must be non-negative integers');
     }
@@ -165,6 +199,18 @@ function comparisonTurnStateSnapshot(array $request): array
         },
         $generalCooldownSelectors,
     );
+    $nationCooldowns = array_map(
+        static function (array $selector) use ($db): array {
+            $nationStorage = KVStorage::getStorage($db, $selector['nationId'], 'nation_env');
+            $nationStorage->resetCache();
+            $value = $nationStorage->getValue("next_execute_{$selector['actionName']}");
+            return [
+                ...$selector,
+                'nextAvailableTurn' => is_int($value) ? $value : null,
+            ];
+        },
+        $nationCooldownSelectors,
+    );
 
     $generals = array_map(
         static function (array $row): array {
@@ -428,6 +474,7 @@ function comparisonTurnStateSnapshot(array $request): array
             'initMonth' => (int)$worldValues['init_month'],
             'develCost' => (int)$worldValues['develcost'],
             'generalCooldowns' => $generalCooldowns,
+            'nationCooldowns' => $nationCooldowns,
         ],
         'generals' => $generals,
         'rankData' => $rankData,