diff --git a/test/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp b/test/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
index 44cec765..ec563fe4 100644
--- a/test/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
+++ b/test/localization/locale.categories/category.monetary/locale.money.get/locale.money.get.members/get_long_double_ru_RU.pass.cpp
@@ -9,6 +9,12 @@
 //
 // XFAIL: apple-darwin
 
+// Failure related to GLIBC's use of U00A0 as mon_thousands_sep
+// and U002E as mon_decimal_point.
+// TODO: U00A0 should be investigated.
+// Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16006
+// XFAIL: linux
+
 // REQUIRES: locale.ru_RU.UTF-8
 
 // <locale>
diff --git a/test/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp b/test/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
index 1f335e46..54bfcfb5 100644
--- a/test/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
+++ b/test/localization/locale.categories/category.monetary/locale.money.put/locale.money.put.members/put_long_double_ru_RU.pass.cpp
@@ -9,6 +9,12 @@
 //
 // XFAIL: apple-darwin
 
+// Failure related to GLIBC's use of U00A0 as mon_thousands_sep
+// and U002E as mon_decimal_point.
+// TODO: U00A0 should be investigated.
+// Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16006
+// XFAIL: linux
+
 // REQUIRES: locale.ru_RU.UTF-8
 
 // <locale>
diff --git a/test/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp b/test/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
index 16d403d3..8270377f 100644
--- a/test/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
+++ b/test/localization/locale.categories/category.monetary/locale.moneypunct.byname/decimal_point.pass.cpp
@@ -7,13 +7,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <locale>
-
 // REQUIRES: locale.en_US.UTF-8
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ru_RU.UTF-8
 // REQUIRES: locale.zh_CN.UTF-8
 
+// Russia uses ',' for the decimal separator. GLIBC returns '.'
+// XFAIL: linux
+
+// <locale>
+
 // class moneypunct_byname<charT, International>
 
 // charT decimal_point() const;