Cannot Load a Specific RSS Feed to WordPress

This website looks like it filters WordPress user-agent then you need to set another user-agent to read this RSS feed like this :

$url = "https://www.voanews.com/api/zq\$omekvi_";

$args = [
    "user-agent" => $_SERVER["HTTP_USER_AGENT"],
];

$response = wp_remote_get($url, $args);