The Parties may, by unanimous agreement, invite any other European State in a position to further the principles of this Treaty and to contribute to the security of the North Atlantic area to accede to this Treaty. Any State so invited may become a Party to the Treaty by depositing its instrument of accession with the Government of the United States of America. The Government of the United States of America will inform each of the Parties of the deposit of each such instrument of accession.
Currently this is agreed by…
New members must uphold democracy, which includes tolerating diversity.
New members must be in the midst of making progress toward a market economy.
The nations’ military forces must be under firm, civilian control.
The nations must be good neighbors and respect sovereignty outside their borders.
The nations must be working toward compatibility with NATO forces.
The principle conditions can change, go, etc. but Article 10 won’t see the votes happen if the current principle conditions listed above aren’t being or can be met upon joining. This is why it’s coincidence you bring up Turkey who had their membership under threat during the 2016 coup attempt as it conflicted with the first and third principles. However, they were met upon joining back in the '50s.
Since Russia obviously won’t be joining, Ukraine joining won’t suddenly have Russia agree with NATO that it’ll do it’s part too to ensure the conditions are met by Ukraine henceforth.