Hi there,
Thank you for getting back to me.
The Ministry of Information and Communications of Kazakhstan, has blocked Bitbucket IPs.
To get this resolved you will need to work with your local ISP.

As a workaround, you can configure a Proxy to route through a different provider or use VPN connection to access Bitbucket from a different network.
Atlassian or Bitbucket, didn't block the IPs from Kazakhstan, this is done on your Government and ISP side.
Please work with them to get this resolved or use the workaround mentioned above.