diff --git a/full-node/src/consensus_service.rs b/full-node/src/consensus_service.rs
index af3743439b..e8c5161faf 100644
--- a/full-node/src/consensus_service.rs
+++ b/full-node/src/consensus_service.rs
@@ -1046,6 +1046,15 @@ impl SyncBackground {
                         all::BlockAnnounceOutcome::InvalidHeader(_) => unreachable!(),
                     }
                 }
+                WakeUpReason::NetworkEvent(network_service::Event::GrandpaNeighborPacket {
+                    chain_id,
+                    peer_id,
+                    finalized_block_height,
+                }) if chain_id == self.network_chain_id => {
+                    let source_id = *self.peers_source_id_map.get(&peer_id).unwrap();
+                    self.sync
+                        .update_source_finality_state(source_id, finalized_block_height);
+                }
                 WakeUpReason::NetworkEvent(_) => {
                     // Different chain index.
                 }
@@ -1602,10 +1611,55 @@ impl SyncBackground {
                 self.sync = idle;
                 (self, false)
             }
-            all::ProcessOne::VerifyWarpSyncFragment(_)
-            | all::ProcessOne::WarpSyncBuildRuntime(_)
-            | all::ProcessOne::WarpSyncBuildChainInformation(_)
-            | all::ProcessOne::WarpSyncFinished { .. } => unreachable!(),
+            all::ProcessOne::VerifyWarpSyncFragment(verify) => {
+                let (new_sync, outcome) = verify.perform(rand::random());
+                self.sync = new_sync;
+                match outcome {
+                    Ok((fragment_hash, fragment_height)) => {
+                        self.log_callback.log(
+                            LogLevel::Debug,
+                            format!(
+                                "justification-verification-success; fragment_hash={}, fragment_height={fragment_height}",
+                                hex::encode(&fragment_hash)
+                            ),
+                        );
+                    }
+                    Err(err) => {
+                        self.log_callback.log(
+                            LogLevel::Warn,
+                            format!("failed-justification-verification; error={err}"),
+                        );
+                    }
+                }
+                (self, true)
+            }
+            all::ProcessOne::WarpSyncBuildRuntime(build_runtime) => {
+                let (new_sync, outcome) =
+                    build_runtime.build(all::ExecHint::CompileAheadOfTime, true);
+                self.sync = new_sync;
+                if let Err(err) = outcome {
+                    self.log_callback.log(
+                        LogLevel::Warn,
+                        format!("failed-warp-sync-runtime-compilation; error={err}"),
+                    );
+                }
+                (self, true)
+            }
+            all::ProcessOne::WarpSyncBuildChainInformation(build_chain_information) => {
+                let (new_sync, outcome) = build_chain_information.build();
+                self.sync = new_sync;
+                if let Err(err) = outcome {
+                    self.log_callback.log(
+                        LogLevel::Warn,
+                        format!("failed-warp-sync-chain-information-build; error={err}"),
+                    );
+                }
+                (self, true)
+            }
+            all::ProcessOne::WarpSyncFinished { sync, .. } => {
+                self.sync = sync;
+                (self, true)
+            }
             all::ProcessOne::VerifyBlock(verify) => {
                 let when_verification_started = Instant::now();
                 let mut database_accesses_duration = Duration::new(0, 0);
diff --git a/full-node/src/network_service.rs b/full-node/src/network_service.rs
index 671363b811..5d0122ba82 100644
--- a/full-node/src/network_service.rs
+++ b/full-node/src/network_service.rs
@@ -141,6 +141,11 @@ pub enum Event {
         scale_encoded_header: Vec<u8>,
         is_best: bool,
     },
+    GrandpaNeighborPacket {
+        chain_id: ChainId,
+        peer_id: PeerId,
+        finalized_block_height: u64,
+    },
 }
 
 pub struct NetworkService {
@@ -1581,7 +1586,13 @@ async fn background_task(mut inner: Inner) {
                     state.set_id,
                     state.commit_finalized_height,
                 ));
-                // TODO: report to the sync state machine
+
+                debug_assert!(inner.event_pending_send.is_none());
+                inner.event_pending_send = Some(Event::GrandpaNeighborPacket {
+                    chain_id,
+                    peer_id,
+                    finalized_block_height: state.commit_finalized_height,
+                });
             }
             WakeUpReason::NetworkEvent(service::Event::GrandpaCommitMessage {
                 chain_id,