Probably depends on the decision, wether to interpret scancodes (key positions) or characters (key meanings). In this case it's characters, and the russian layout doesn't have a C (Latin-Letter-Cee), so you can't enter Control-C, only Control-Cyrillic-Letter-Es, which leads to OP's situation.

In reply to Re^5: Windows Tk issue Copy and Paste Russian keyboard by soonix
in thread Windows Tk issue Copy and Paste Russian keyboard by IB2017

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