--- contrib/python/moto/py3/moto/cognitoidp/responses.py	(index)
+++ contrib/python/moto/py3/moto/cognitoidp/responses.py	(working tree)
@@ -615,10 +615,8 @@ class CognitoIdpResponse(BaseResponse):
 
 class CognitoIdpJsonWebKeyResponse(BaseResponse):
     def __init__(self):
-        with open(
-            os.path.join(os.path.dirname(__file__), "resources/jwks-public.json")
-        ) as f:
-            self.json_web_key = f.read()
+        import pkgutil
+        self.json_web_key = pkgutil.get_data(__package__, 'resources/jwks-public.json')
 
     def serve_json_web_key(
         self, request, full_url, headers
--- contrib/python/moto/py3/moto/ec2/models/amis.py	(index)
+++ contrib/python/moto/py3/moto/ec2/models/amis.py	(working tree)
@@ -21,7 +21,7 @@ if "MOTO_AMIS_PATH" in environ:
     with open(environ.get("MOTO_AMIS_PATH"), "r", encoding="utf-8") as f:
         AMIS = json.load(f)
 else:
-    AMIS = load_resource(__name__, "../resources/amis.json")
+    AMIS = load_resource("moto.ec2", "resources/amis.json")
 
 
 class Ami(TaggedEC2Resource):
@@ -156,7 +156,7 @@ class AmiBackend:
             self.amis[ami_id] = Ami(self, **ami)
         try:
             latest_amis = load_resource(
-                __name__, f"../resources/latest_amis/{self.region_name}.json"
+                "moto.ec2", f"resources/latest_amis/{self.region_name}.json"
             )
             for ami in latest_amis:
                 ami_id = ami["ami_id"]
--- contrib/python/moto/py3/moto/ec2/models/instance_types.py	(index)
+++ contrib/python/moto/py3/moto/ec2/models/instance_types.py	(working tree)
@@ -6,19 +6,27 @@ from ..utils import generic_filter
 from moto.utilities.utils import load_resource
 from ..exceptions import InvalidFilter, InvalidInstanceTypeError
 
-INSTANCE_TYPES = load_resource(__name__, "../resources/instance_types.json")
+import library.python.resource as _ya_res
+import os
+import json
+
+INSTANCE_TYPES = load_resource("moto.ec2", "resources/instance_types.json")
 INSTANCE_FAMILIES = list(set([i.split(".")[0] for i in INSTANCE_TYPES.keys()]))
 
-root = pathlib.Path(__file__).parent
-offerings_path = "../resources/instance_type_offerings"
+root = pathlib.Path(__file__).parent.parent
+offerings_path = "resources/instance_type_offerings"
 INSTANCE_TYPE_OFFERINGS = {}
-for _location_type in listdir(root / offerings_path):
-    INSTANCE_TYPE_OFFERINGS[_location_type] = {}
-    for _region in listdir(root / offerings_path / _location_type):
-        full_path = offerings_path + "/" + _location_type + "/" + _region
-        res = load_resource(__name__, full_path)
-        for instance in res:
-            instance["LocationType"] = _location_type
+for entry in _ya_res.resfs_files(prefix=str(root / offerings_path)):
+    rel_path = os.path.relpath(entry, root / offerings_path)
+    path_parts = os.path.normpath(rel_path).split(os.path.sep)
+    if len(path_parts) != 2:
+        continue
+    _location_type, _region = path_parts
+    if _location_type not in INSTANCE_TYPE_OFFERINGS:
+        INSTANCE_TYPE_OFFERINGS[_location_type] = {}
+    res = json.loads(_ya_res.find(f"resfs/file/{entry}"))
+    for instance in res:
+        instance["LocationType"] = _location_type
         INSTANCE_TYPE_OFFERINGS[_location_type][_region.replace(".json", "")] = res
 
 
--- contrib/python/moto/py3/moto/s3/responses.py	(index)
+++ contrib/python/moto/py3/moto/s3/responses.py	(working tree)
@@ -283,6 +283,8 @@ class S3Response(BaseResponse):
                 request.headers.get("Authorization", "")
             )
             region_name = region_name or DEFAULT_REGION_NAME
+            if region_name == "yandex":
+                region_name = DEFAULT_REGION_NAME
 
         bucket_name = self.parse_bucket_name_from_url(request, full_url)
         if not bucket_name: