diff --git a/srcs/compose/compile.py b/srcs/compose/compile.py
index 5744eaf..125e18c 100644
--- a/srcs/compose/compile.py
+++ b/srcs/compose/compile.py
@@ -99,9 +99,12 @@ def strip_cstyle_comments(inp):
 
 # Parse from a json file containing a dictionary sequence → result string.
 def parse_sequences_file_json(fname):
-    with open(fname, "r") as inp:
-        seqs = json.loads(strip_cstyle_comments(inp))
-    return list(seqs.items())
+    try:
+        with open(fname, "r") as inp:
+            seqs = json.loads(strip_cstyle_comments(inp))
+        return list(seqs.items())
+    except Exception as e:
+        print("Failed parsing '%s': %s" % (fname, str(e)), file=sys.stderr)
 
 # Format of the sequences file is determined by its extension
 def parse_sequences_file(fname, xkb_char_extra_names={}):
diff --git a/srcs/compose/compose/cyrillic.json b/srcs/compose/compose/cyrillic.json
new file mode 100644
index 0000000..f6f2f1f
--- /dev/null
+++ b/srcs/compose/compose/cyrillic.json
@@ -0,0 +1,138 @@
+{
+  "\"": {
+    "і": "ї"
+  },
+  ",": {
+    "г": "ӻ",
+    "к": "ӄ",
+    "л": "ԓ",
+    "н": "ӈ",
+    "х": "ӽ"
+  },
+  ".": {
+    "г": "ӷ",
+    "ж": "җ",
+    "й": "ҋ",
+    "к": "қ",
+    "м": "ӎ",
+    "н": "ӊ",
+    "і": "ї"
+  },
+  "а": {
+    "е": "ѣ",
+    "у": "ѡ",
+    "ъ": "ѣ",
+    "ы": "ѣ",
+    "ь": "ꙙ",
+    "э": "ѣ",
+    "є": "ѣ",
+    "ꙑ": "ѣ"
+  },
+  "г": {
+    ",": "ӻ",
+    ".": "ӷ",
+    "й": "ғ",
+    "х": "ҁ",
+    "ј": "ғ"
+  },
+  "д": {
+    "е": "ꙉ",
+    "ж": "џ",
+    "з": "ꙃ",
+    "й": "ꙉ",
+    "ј": "ꙉ"
+  },
+  "е": {
+    "о": "ё"
+  },
+  "ж": {
+    ".": "җ"
+  },
+  "з": {
+    "ф": "ҙ"
+  },
+  "и": {
+    "и": "ӣ",
+    "й": "ӣ",
+    "у": "ѵ",
+    "ј": "ӣ"
+  },
+  "й": {
+    ".": "ҋ"
+  },
+  "к": {
+    ",": "ӄ",
+    ".": "қ",
+    "г": "ґ",
+    "с": "ѯ",
+    "х": "ҁ",
+    "ш": "ѯ"
+  },
+  "л": {
+    ",": "ԓ",
+    "ь": "љ"
+  },
+  "м": {
+    ".": "ӎ"
+  },
+  "н": {
+    ",": "ӈ",
+    ".": "ӊ",
+    "ь": "њ"
+  },
+  "о": {
+    "т": "ѿ",
+    "у": "ѹ"
+  },
+  "п": {
+    "с": "ѱ",
+    "ш": "ѱ"
+  },
+  "т": {
+    "й": "ћ",
+    "ф": "ѳ",
+    "ј": "ћ"
+  },
+  "у": {
+    "у": "ӯ",
+    "ъ": "ў"
+  },
+  "х": {
+    ",": "ӽ",
+    "й": "ҳ",
+    "ь": "ҳ",
+    "ј": "ҳ"
+  },
+  "ш": {
+    "ч": "щ"
+  },
+  "ы": {
+    "у": "ѡ",
+    "ъ": "ꙑ"
+  },
+  "ю": {
+    "а": "ꙓ",
+    "е": "ѥ",
+    "м": "ѭ",
+    "н": "ѩ",
+    "э": "ѥ"
+  },
+  "я": {
+    "ь": "ꙝ"
+  },
+  "і": {
+    "\"": "ї",
+    ".": "ї",
+    "й": "ӣ",
+    "у": "ѵ",
+    "і": "ӣ",
+    "ј": "ӣ"
+  },
+  "ѡ": {
+    "т": "ѿ"
+  },
+  "ꙑ": {
+    "ь": "ы",
+    "у": "ѡ"
+  }
+}
diff --git a/srcs/compose/fn.json b/srcs/compose/fn.json
index 5a977ba..70fc061 100644
--- a/srcs/compose/fn.json
+++ b/srcs/compose/fn.json
@@ -37,6 +37,7 @@
   "†": "‡",
   "×": "∙",
   " ": "nbsp",
+
   // arrows
   "↖": "⇖",
   "↑": "⇑",
@@ -87,6 +88,7 @@
   "⊂": "⊆",
   "⊃": "⊇",
   "±": "∓",
+
   // hebrew niqqud
   "ק": "qamats", // kamatz
   "ר": "hataf_qamats", // reduced kamatz
@@ -101,6 +103,7 @@
   "ס": "segol",
   "ב": "hataf_segol", // reduced segol
   "צ": "tsere",
+
   // Devanagari symbols
   "ए": "ऍ",
   "े": "ॅ",
@@ -157,6 +160,7 @@
   "ं": "ॕ",
   "़": "ॎ",
   "ऽ": "ॽ",
+
   // Persian numbers
   "۱": "f1",
   "۲": "f2",
@@ -178,5 +182,38 @@
   "٧": "f7",
   "٨": "f8",
   "٩": "f9",
-  "٠": "f10"
+  "٠": "f10",
+
+  // Cyrillic
+  "ꙑ": "ы",
+  "ы": "ꙑ",
+  "ш": "ѱ",
+  "з": "ꙁ",
+  "и": "і",
+  "і": "и",
+  "я": "ꙗ",
+  "е": "ѥ",
+  "ѡ": "ꙍ",
+  "о": "ѻ",
+  "а": "ѣ",
+  "э": "є",
+  "ъ": "ь",
+  "ь": "ъ",
+  "й": "ј",
+  "ꙉ": "ђ",
+  "ч": "ћ",
+  "ҁ": "қ",
+  "қ": "ҁ",
+  "џ": "ҷ",
+  "ҷ": "џ",
+  "ј": "й",
+  "у": "ꙋ",
+  "м": "ѫ",
+  "н": "ѧ",
+  "с": "ѕ",
+  "л": "ԯ",
+  "ԓ": "ԯ",
+  "\ua67d": "\u0483",
+  "\u0487": "\ua66f",
+  "ӈ": "ԩ"
 }
diff --git a/srcs/juloo.keyboard2/ComposeKeyData.java b/srcs/juloo.keyboard2/ComposeKeyData.java
index 8a876ac..afac294 100644
Binary files a/srcs/juloo.keyboard2/ComposeKeyData.java and b/srcs/juloo.keyboard2/ComposeKeyData.java differ