Select UPPER CASE list items with spaces and punctuation

The following code might not be quite fast but it takes into account foreign languages.

list = {"Bob Jones", "ACME-SYSTEMS", "John Smith", "FUTURETECH123", 
   "Sally Jones", "CITY SCHOOL", "Jane Black", "CONSULTANT", 
   "Max Speed", "A.B. CORP", "TЯUMP", "яUSSIam"};
Select[list, ToUpperCase[#] === # &]

You can see it catches the Russian TЯUMP.

---

UPDATE

Apparently, Russians cannot be caught. In the example below, an accented letter á (as those used in Spanish) is processed by the system but the Russian one is quite stealthy.

string = "áа";
ToCharacterCode[string]
ToUpperCase[string]
(*
{225, 1072}
"Áа"
*)

The simplest regex that I can think of that does what the OP asks is the following:

list // Pick[#, StringContainsQ[#, RegularExpression["^[^a-z]+$"]]] &

"ACME-SYSTEMS", "FUTURETECH123", "CITY SCHOOL", "CONSULTANT", "A.B. \ CORP"}

For the cases discussed by Hector, maybe:

Join[list, {"TЯUMP", "яUSSIam", "ЯЯ", "TЯЯUMP", "Яя", "TЯяUMP"}] 
// Pick[#, StringContainsQ[#, RegularExpression["^[^a-zа-я]+$"]]] &

{"ACME-SYSTEMS", "FUTURETECH123", "CITY SCHOOL", "CONSULTANT", "A.B. \ CORP", "TЯUMP", "ЯЯ", "TЯЯUMP"}

Original WRONG answer

list2 // Pick[#, StringContainsQ[#, RegularExpression["[ALPHA]"]]] &

{"ACME-SYSTEMS", "FUTURETECH123", "CITY SCHOOL", "CONSULTANT", "A.B. \ CORP", "TЯUMP"}

A very beautiful solution, which gives the right answer. Things began to unravel, however, when I read Hector's comment, got an unexpected result, and tried the following:

 list// Pick[#, StringContainsQ[#, RegularExpression["[ALPHB]"]]]&

{"Bob Jones", "ACME-SYSTEMS", "FUTURETECH123", "CITY SCHOOL", "Jane \ Black", "CONSULTANT", "A.B. CORP"}