diff --git a/ets2panda/checker/ets/object.cpp b/ets2panda/checker/ets/object.cpp
index ce34a1924ac2dc50a43986af0cd206303170f074..1649138262b54c8c8462130c35a4ea3919216d61 100644
--- a/ets2panda/checker/ets/object.cpp
+++ b/ets2panda/checker/ets/object.cpp
@@ -187,6 +187,10 @@ bool ETSChecker::ComputeSuperType(ETSObjectType *type)
 void ETSChecker::ValidateImplementedInterface(ETSObjectType *type, Type *interface,
                                               std::unordered_set<Type *> *extendsSet, const lexer::SourcePosition &pos)
 {
+    if (interface->IsETSObjectType() && interface->AsETSObjectType()->HasObjectFlag(ETSObjectFlags::CLASS)) {
+        LogError(diagnostic::INTERFACE_EXTENDS_CLASS, {}, pos);
+        return;
+    }
     if (!interface->IsETSObjectType() || !interface->AsETSObjectType()->HasObjectFlag(ETSObjectFlags::INTERFACE)) {
         LogError(diagnostic::NOT_INTERFACE, {}, pos);
         return;
diff --git a/ets2panda/parser/ETSparser.cpp b/ets2panda/parser/ETSparser.cpp
index 36001a7946a083e80444d63fcd2b0a9da50d1cb3..9a591d8e19727b8d723a76ada9a00722ac42e7cf 100644
--- a/ets2panda/parser/ETSparser.cpp
+++ b/ets2panda/parser/ETSparser.cpp
@@ -1191,6 +1191,10 @@ ir::ETSImportDeclaration *ETSParser::ParseImportPathBuildImport(ArenaVector<ir::
         BuildImportDeclaration(importKind, std::move(specifiers), importPathStringLiteral,
                                const_cast<parser::Program *>(GetContext().GetProgram()), importFlags);
     importDeclaration->SetRange({startLoc, importPathStringLiteral->End()});
+    if (Lexer()->GetToken().Ident().Is("assert")) {
+        LogError(diagnostic::ERROR_ARKTS_NO_IMPORT_ASSERTIONS);
+        return importDeclaration;
+    }
     ConsumeSemicolon(importDeclaration);
     return importDeclaration;
 }
@@ -1494,6 +1498,10 @@ ir::AstNode *ETSParser::ParseImportDefaultSpecifier(ArenaVector<ir::AstNode *> *
         }
     }
 
+    if (Lexer()->GetToken().Type() == lexer::TokenType::PUNCTUATOR_SUBSTITUTION) {
+        LogError(diagnostic::ERROR_ARKTS_NO_REQUIRE);
+        return nullptr;
+    }
     if (Lexer()->GetToken().KeywordType() != lexer::TokenType::KEYW_FROM) {
         LogExpectedToken(lexer::TokenType::KEYW_FROM);
         Lexer()->NextToken();  // eat 'from'
diff --git a/ets2panda/test/ast/parser/ets/import_assertion.ets b/ets2panda/test/ast/parser/ets/import_assertion.ets
new file mode 100644
index 0000000000000000000000000000000000000000..bbf4ed4a28bea17c89c9a37aa2acf3f6143bb3bc
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/import_assertion.ets
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as Pt from "mod" /* @@ label1 */assert /* @@ label2 */{ type: /* @@ label3 */"json" }
+
+
+/* @@@ label1 Error SyntaxError: Import assertion is not supported, please use the ordinary import syntax instead! */
+/* @@@ label1 Error TypeError: Unresolved reference assert */
+/* @@@ label2 Error SyntaxError: Unexpected token '{'. */
+/* @@@ label3 Error SyntaxError: Label must be followed by a loop statement. */
diff --git a/ets2panda/test/ast/parser/ets/import_require.ets b/ets2panda/test/ast/parser/ets/import_require.ets
new file mode 100644
index 0000000000000000000000000000000000000000..ad8766f57b15aa3ff127e8aa45c4e8fd08d393da
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/import_require.ets
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import m /* @@ label1 */= /* @@ label2 */require("mod")
+
+/* @@@ label1 Error SyntaxError: Importing by 'require' and 'import' assignment is not supported, use 'import * as ... from ...' form instead! */
+/* @@@ label1 Error SyntaxError: Unexpected token '='. */
+/* @@@ label2 Error SyntaxError: Unexpected token 'require'. */
+/* @@@ label2 Error TypeError: Unresolved reference require */
diff --git a/ets2panda/test/ast/parser/ets/interface_extends_class.ets b/ets2panda/test/ast/parser/ets/interface_extends_class.ets
new file mode 100644
index 0000000000000000000000000000000000000000..6e88716f0c466a20fc1b95f31c4989e730b5f135
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/interface_extends_class.ets
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class A {}
+
+interface BInterface extends /* @@ label */A {}
+
+/* @@@ label Error TypeError: Interfaces cannot extend classes, only other interfaces. */
diff --git a/ets2panda/util/diagnostic/semantic.yaml b/ets2panda/util/diagnostic/semantic.yaml
index 95946196dcd9c41687bd58f1e23189202269ff12..568a3b73128a4625368f0bb392f21c0762ebe352 100644
--- a/ets2panda/util/diagnostic/semantic.yaml
+++ b/ets2panda/util/diagnostic/semantic.yaml
@@ -1494,3 +1494,7 @@ semantic:
 - name: SUPER_NOT_ACCESSIBLE
   id: 377
   message: "Class field '{}' defined by the parent class is not accessible in the child class via super."
+
+- name: INTERFACE_EXTENDS_CLASS
+  id: 373
+  message: "Interfaces cannot extend classes, only other interfaces."
diff --git a/ets2panda/util/diagnostic/syntax.yaml b/ets2panda/util/diagnostic/syntax.yaml
index c6a4d4e840a101aa96537ea7ba4f7beb758cd1b5..524f1a311296371a716d0a660fab0577238e9c68 100644
--- a/ets2panda/util/diagnostic/syntax.yaml
+++ b/ets2panda/util/diagnostic/syntax.yaml
@@ -1243,3 +1243,11 @@ syntax:
 - name: ERROR_ARKTS_NO_AMBIENT_DECLS
   id: 308
   message: "Ambient module declaration is not supported!"
+
+- name: ERROR_ARKTS_NO_REQUIRE
+  id: 309
+  message: "Importing by 'require' and 'import' assignment is not supported, use 'import * as ... from ...' form instead!"
+
+- name: ERROR_ARKTS_NO_IMPORT_ASSERTIONS
+  id: 310
+  message: "Import assertion is not supported, please use the ordinary import syntax instead!"