diff --git a/Lib/test/test_isinstance.py b/Lib/test/test_isinstance.py
index 9d37cff99..a8d6ddb90 100644
--- a/Lib/test/test_isinstance.py
+++ b/Lib/test/test_isinstance.py
@@ -316,6 +316,7 @@ class TestIsInstanceIsSubclass(unittest.TestCase):
             self.assertRaises(RecursionError, issubclass, int, X())
             self.assertRaises(RecursionError, isinstance, 1, X())
 
+    @unittest.skip("TODO: RUSTPYTHON")
     def test_infinite_recursion_via_bases_tuple(self):
         """Regression test for bpo-30570."""
         class Failure(object):
@@ -325,6 +326,7 @@ class TestIsInstanceIsSubclass(unittest.TestCase):
             with self.assertRaises(RecursionError):
                 issubclass(Failure(), int)
 
+    @unittest.skip("TODO: RUSTPYTHON")
     def test_infinite_cycle_in_bases(self):
         """Regression test for bpo-30570."""
         class X: