diff --git a/backend/app/api/v1/assignments.py b/backend/app/api/v1/assignments.py
index 7ce7bfb..089c545 100644
--- a/backend/app/api/v1/assignments.py
+++ b/backend/app/api/v1/assignments.py
@@ -354,7 +354,8 @@ async def create_dispute(
             db,
             user_id=assignment.participant.user_id,
             marathon_title=marathon.title,
-            challenge_title=assignment.challenge.title
+            challenge_title=assignment.challenge.title,
+            assignment_id=assignment_id
         )
 
     # Load relationships for response
diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index cea12b1..8d8db03 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -23,6 +23,9 @@ class Settings(BaseSettings):
     TELEGRAM_BOT_USERNAME: str = ""
     TELEGRAM_LINK_TOKEN_EXPIRE_MINUTES: int = 10
 
+    # Frontend
+    FRONTEND_URL: str = "http://localhost:3000"
+
     # Uploads
     UPLOAD_DIR: str = "uploads"
     MAX_IMAGE_SIZE: int = 15 * 1024 * 1024  # 15 MB
diff --git a/backend/app/main.py b/backend/app/main.py
index 4903c09..b9737e7 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1,6 +1,13 @@
+import logging
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+)
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from pathlib import Path
diff --git a/backend/app/services/telegram_notifier.py b/backend/app/services/telegram_notifier.py
index 3f3def7..eda328c 100644
--- a/backend/app/services/telegram_notifier.py
+++ b/backend/app/services/telegram_notifier.py
@@ -22,7 +22,8 @@ class TelegramNotifier:
         self,
         chat_id: int,
         text: str,
-        parse_mode: str = "HTML"
+        parse_mode: str = "HTML",
+        reply_markup: dict | None = None
     ) -> bool:
         """Send a message to a Telegram chat."""
         if not self.bot_token:
@@ -31,13 +32,17 @@ class TelegramNotifier:
 
         try:
             async with httpx.AsyncClient() as client:
+                payload = {
+                    "chat_id": chat_id,
+                    "text": text,
+                    "parse_mode": parse_mode
+                }
+                if reply_markup:
+                    payload["reply_markup"] = reply_markup
+
                 response = await client.post(
                     f"{self.api_url}/sendMessage",
-                    json={
-                        "chat_id": chat_id,
-                        "text": text,
-                        "parse_mode": parse_mode
-                    },
+                    json=payload,
                     timeout=10.0
                 )
                 if response.status_code == 200:
@@ -53,7 +58,8 @@ class TelegramNotifier:
         self,
         db: AsyncSession,
         user_id: int,
-        message: str
+        message: str,
+        reply_markup: dict | None = None
     ) -> bool:
         """Send notification to a user by user_id."""
         result = await db.execute(
@@ -61,10 +67,16 @@ class TelegramNotifier:
         )
         user = result.scalar_one_or_none()
 
-        if not user or not user.telegram_id:
+        if not user:
+            logger.warning(f"[Notify] User {user_id} not found")
             return False
 
-        return await self.send_message(user.telegram_id, message)
+        if not user.telegram_id:
+            logger.warning(f"[Notify] User {user_id} ({user.nickname}) has no telegram_id")
+            return False
+
+        logger.info(f"[Notify] Sending to user {user.nickname} (telegram_id={user.telegram_id})")
+        return await self.send_message(user.telegram_id, message, reply_markup=reply_markup)
 
     async def notify_marathon_participants(
         self,
@@ -171,16 +183,41 @@ class TelegramNotifier:
         db: AsyncSession,
         user_id: int,
         marathon_title: str,
-        challenge_title: str
+        challenge_title: str,
+        assignment_id: int
     ) -> bool:
         """Notify user about dispute raised on their assignment."""
-        message = (
-            f"⚠️ <b>На твоё задание подан спор</b>\n\n"
-            f"Марафон: {marathon_title}\n"
-            f"Задание: {challenge_title}\n\n"
-            f"Зайди на сайт, чтобы ответить на спор."
-        )
-        return await self.notify_user(db, user_id, message)
+        logger.info(f"[Dispute] Sending notification to user_id={user_id} for assignment_id={assignment_id}")
+
+        dispute_url = f"{settings.FRONTEND_URL}/assignments/{assignment_id}"
+        logger.info(f"[Dispute] URL: {dispute_url}")
+
+        # Telegram requires HTTPS for inline keyboard URLs
+        use_inline_button = dispute_url.startswith("https://")
+
+        if use_inline_button:
+            message = (
+                f"⚠️ <b>На твоё задание подан спор</b>\n\n"
+                f"Марафон: {marathon_title}\n"
+                f"Задание: {challenge_title}"
+            )
+            reply_markup = {
+                "inline_keyboard": [[
+                    {"text": "Открыть спор", "url": dispute_url}
+                ]]
+            }
+        else:
+            message = (
+                f"⚠️ <b>На твоё задание подан спор</b>\n\n"
+                f"Марафон: {marathon_title}\n"
+                f"Задание: {challenge_title}\n\n"
+                f"🔗 {dispute_url}"
+            )
+            reply_markup = None
+
+        result = await self.notify_user(db, user_id, message, reply_markup=reply_markup)
+        logger.info(f"[Dispute] Notification result: {result}")
+        return result
 
     async def notify_dispute_resolved(
         self,