Calling Windows executables from Python with Unicode arguments

Question

When using os.spawnl() or subprocess.run() functions from Python, Unicode arguments (for example, path values) gets passed as gibberish, and the called executable can't use them.

>>> subprocess.run(["ping", "ğü"], stdout=subprocess.PIPE).stdout
b'Ping request could not find host \xa7\x81. Please check the name and try again.\r\n'

PS C:\Users\flc> C:\Windows\system32\PING.EXE ğü
Ping request could not find host ğü. Please check the name and try again.

Strangely, this doesn't happen with nslookup:

>>> subprocess.run(["nslookup", "ğü"], stdout=subprocess.PIPE).stdout`
`*** one.one.one.one can't find ğü: Non-existent domain`
`b'Server:  one.one.one.one\r\nAddress:  1.1.1.1\r\n\r\n'

I tested this with dir and echo, but since they require shell=True, I wasn't sure if it was making things seem OK. Hence I picked ping and nslookup.

Characters "ğü" are interpreted as "\xa7\x81" by called programs. While on Powershell, ping works with Unicode characters. Replacement characters use cp1254. It seems like even if I instruct Python to use utf-8, it passes arguments in my local encoding.

What's happening here? How can I safely pass arguments to spawned executables? Is this a problem with Python, or the target executable?