tcsh called by sshd for invocation of scp: `tcsh -c scp -f Расписание.pdf`
At this time no any LC_* is set.
tcsh read .cshrc and set LC_CTYPE=ru_RU.UTF-8 LC_COLLATE=ru_RU.UTF-8.
After this invocation of scp will be incorrect:

00007ab0  20 2d 66 20 c3 90 c2 a0  c3 90 c2 b0 c3 91 c2 81  | -f ............|
00007ac0  c3 90 c2 bf c3 90 c2 b8  c3 91 c2 81 c3 90 c2 b0  |................|
00007ad0  c3 90 c2 bd c3 90 c2 b8  c3 90 c2 b5 5f c3 90 c2  |............_...|
00007ae0  a2 c3 90 c2 97 c3 90 c2  98 2e 70 64 66 0a        |..........pdf.  |

Correct invocation must be:

00000000                                       20 2d 66 20  |             -f |
00000010  d0 a0 d0 b0 d1 81 d0 bf  d0 b8 d1 81 d0 b0 d0 bd  |................|
00000020  d0 b8 d0 b5 5f d0 a2 d0  97 d0 98 2e 70 64 66 0a  |...._.......pdf.|

`d0` =>  `c3 90`
`a0` =>  `c2 a0`

I.e. every byte re-encoded to utf-8: `d0` =>  `c3 90`

As result imposible to access files w/ non-ascii names.
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