diff --git a/backend/app/api/v1/assignments.py b/backend/app/api/v1/assignments.py
index f149de5..d9dbdb2 100644
--- a/backend/app/api/v1/assignments.py
+++ b/backend/app/api/v1/assignments.py
@@ -1,7 +1,7 @@
 """
 Assignment details and dispute system endpoints.
 """
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from fastapi import APIRouter, HTTPException, Request
 from fastapi.responses import Response, StreamingResponse
 from sqlalchemy import select
@@ -49,7 +49,9 @@ def build_dispute_response(dispute: Dispute, current_user_id: int) -> DisputeRes
             my_vote = v.vote
             break
 
-    expires_at = dispute.created_at + timedelta(hours=DISPUTE_WINDOW_HOURS)
+    # Ensure expires_at has UTC timezone info for correct frontend parsing
+    created_at_utc = dispute.created_at.replace(tzinfo=timezone.utc) if dispute.created_at.tzinfo is None else dispute.created_at
+    expires_at = created_at_utc + timedelta(hours=DISPUTE_WINDOW_HOURS)
 
     return DisputeResponse(
         id=dispute.id,
diff --git a/backend/app/api/v1/feed.py b/backend/app/api/v1/feed.py
index 790990f..37faf67 100644
--- a/backend/app/api/v1/feed.py
+++ b/backend/app/api/v1/feed.py
@@ -3,7 +3,8 @@ from sqlalchemy import select, func
 from sqlalchemy.orm import selectinload
 
 from app.api.deps import DbSession, CurrentUser
-from app.models import Activity, Participant
+from app.models import Activity, Participant, Dispute, ActivityType
+from app.models.dispute import DisputeStatus
 from app.schemas import FeedResponse, ActivityResponse, UserPublic
 
 router = APIRouter(tags=["feed"])
@@ -44,16 +45,40 @@ async def get_feed(
     )
     activities = result.scalars().all()
 
-    items = [
-        ActivityResponse(
-            id=a.id,
-            type=a.type,
-            user=UserPublic.model_validate(a.user),
-            data=a.data,
-            created_at=a.created_at,
+    # Get assignment_ids from complete activities to check for disputes
+    complete_assignment_ids = []
+    for a in activities:
+        if a.type == ActivityType.COMPLETE.value and a.data and a.data.get("assignment_id"):
+            complete_assignment_ids.append(a.data["assignment_id"])
+
+    # Get disputes for these assignments
+    disputes_map: dict[int, str] = {}
+    if complete_assignment_ids:
+        result = await db.execute(
+            select(Dispute).where(Dispute.assignment_id.in_(complete_assignment_ids))
+        )
+        for dispute in result.scalars().all():
+            disputes_map[dispute.assignment_id] = dispute.status
+
+    items = []
+    for a in activities:
+        data = dict(a.data) if a.data else {}
+
+        # Add dispute status to complete activities
+        if a.type == ActivityType.COMPLETE.value and a.data and a.data.get("assignment_id"):
+            assignment_id = a.data["assignment_id"]
+            if assignment_id in disputes_map:
+                data["dispute_status"] = disputes_map[assignment_id]
+
+        items.append(
+            ActivityResponse(
+                id=a.id,
+                type=a.type,
+                user=UserPublic.model_validate(a.user),
+                data=data if data else None,
+                created_at=a.created_at,
+            )
         )
-        for a in activities
-    ]
 
     return FeedResponse(
         items=items,
diff --git a/frontend/src/components/ActivityFeed.tsx b/frontend/src/components/ActivityFeed.tsx
index 790a34e..8036382 100644
--- a/frontend/src/components/ActivityFeed.tsx
+++ b/frontend/src/components/ActivityFeed.tsx
@@ -2,7 +2,7 @@ import { useState, useEffect, useCallback, useRef, useImperativeHandle, forwardR
 import { useNavigate } from 'react-router-dom'
 import { feedApi } from '@/api'
 import type { Activity, ActivityType } from '@/types'
-import { Loader2, ChevronDown, Bell, ExternalLink } from 'lucide-react'
+import { Loader2, ChevronDown, Bell, ExternalLink, AlertTriangle } from 'lucide-react'
 import {
   formatRelativeTime,
   getActivityIcon,
@@ -177,9 +177,13 @@ function ActivityItem({ activity }: ActivityItemProps) {
   const isEvent = isEventActivity(activity.type)
   const { title, details, extra } = formatActivityMessage(activity)
 
-  // Get assignment_id for complete activities
-  const assignmentId = activity.type === 'complete' && activity.data
-    ? (activity.data as { assignment_id?: number }).assignment_id
+  // Get assignment_id and dispute status for complete activities
+  const activityData = activity.data as { assignment_id?: number; dispute_status?: string } | null
+  const assignmentId = activity.type === 'complete' && activityData?.assignment_id
+    ? activityData.assignment_id
+    : null
+  const disputeStatus = activity.type === 'complete' && activityData?.dispute_status
+    ? activityData.dispute_status
     : null
 
   if (isEvent) {
@@ -247,15 +251,29 @@ function ActivityItem({ activity }: ActivityItemProps) {
               {extra}
             </div>
           )}
-          {/* Details button for complete activities */}
+          {/* Details button and dispute indicator for complete activities */}
           {assignmentId && (
-            <button
-              onClick={() => navigate(`/assignments/${assignmentId}`)}
-              className="mt-2 text-xs text-primary-400 hover:text-primary-300 flex items-center gap-1"
-            >
-              <ExternalLink className="w-3 h-3" />
-              Детали
-            </button>
+            <div className="flex items-center gap-3 mt-2">
+              <button
+                onClick={() => navigate(`/assignments/${assignmentId}`)}
+                className="text-xs text-primary-400 hover:text-primary-300 flex items-center gap-1"
+              >
+                <ExternalLink className="w-3 h-3" />
+                Детали
+              </button>
+              {disputeStatus === 'open' && (
+                <span className="text-xs text-orange-400 flex items-center gap-1">
+                  <AlertTriangle className="w-3 h-3" />
+                  Оспаривается
+                </span>
+              )}
+              {disputeStatus === 'valid' && (
+                <span className="text-xs text-red-400 flex items-center gap-1">
+                  <AlertTriangle className="w-3 h-3" />
+                  Отклонено
+                </span>
+              )}
+            </div>
           )}
         </div>
       </div>