Question about Cyrillic domain

Hello, is it possible to install Your certificate on a domain type http://чатвип.рф/

Not yet. According to https://letsencrypt.org/upcoming-features/ this (IDN support) is planned to be added before August.

Is the page https://letsencrypt.org/upcoming-features/ up to date ?
Because the IPv6 is not described as resolved like the other topics
but over the due date.

thanks for contributing!