Option require_secure_transport is not working

[Михаил Ясько]

Hello All!
Mysql version 8.0.19 . Os - ubuntu 18.04.3 . I'm created certificates and added a section to /etc/mysql/my.cnf

[mysqld]
ssl_ca = ca.pem
ssl_cert = server-cert.pem
ssl_key = server-key.pem
require_secure_transport = ON

However, I still have the option to connect without ssl. When connect established i see result of query:
mysql> SHOW VARIABLES LIKE 'require_secure_transport';

+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| require_secure_transport | ON |
+--------------------------+-------+
I neet to disable insecure connect to mysql. Can anybody help me ?