diff --git a/src/core/execution/nation/NationAllianceBehavior.ts b/src/core/execution/nation/NationAllianceBehavior.ts
index 186a3b556..410e1a63e 100644
--- a/src/core/execution/nation/NationAllianceBehavior.ts
+++ b/src/core/execution/nation/NationAllianceBehavior.ts
@@ -76,6 +76,11 @@ export class NationAllianceBehavior {
     otherPlayer: Player,
     isResponse: boolean,
   ): boolean {
+    // Reject alliance requests during the spawn phase
+    if (this.game.inSpawnPhase()) {
+      return false;
+    }
+
     // Easy (dumb) nations sometimes get confused and accept/reject randomly (Just like dumb humans do)
     if (this.isConfused()) {
       return this.random.chance(2);
diff --git a/tests/NationAllianceBehavior.test.ts b/tests/NationAllianceBehavior.test.ts
index ea2c74077..2849ac75b 100644
--- a/tests/NationAllianceBehavior.test.ts
+++ b/tests/NationAllianceBehavior.test.ts
@@ -51,6 +51,10 @@ describe("AllianceBehavior.handleAllianceRequests", () => {
       player,
       new NationEmojiBehavior(random, game, player),
     );
+
+    while (game.inSpawnPhase()) {
+      game.executeNextTick();
+    }
   });
 
   function setupAllianceRequest({
@@ -92,6 +96,16 @@ describe("AllianceBehavior.handleAllianceRequests", () => {
     return mockRequest;
   }
 
+  test("should reject alliance during spawn phase", () => {
+    vi.spyOn(game, "inSpawnPhase").mockReturnValue(true);
+    const request = setupAllianceRequest({});
+
+    allianceBehavior.handleAllianceRequests();
+
+    expect(request.accept).not.toHaveBeenCalled();
+    expect(request.reject).toHaveBeenCalled();
+  });
+
   test("should accept alliance when all conditions are met", () => {
     const request = setupAllianceRequest({});