iCloud account has been breached

You're right, it is a scam. Apple doesn't make unsolicited phone calls. If there was a problem you would be notified when attempting to log in, including when logging into this forum. Also see: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

While it’s def a scam, anytime is a good time to login to https://appleid.apple.com/ and review/confirm that all of your settings are correct.

Pay particular attention to your 2FA trusted numbers. Delete any “old” ones and make sure you have at least one good “alternate” number in-case you loose your iPhone.

has my account been breached by foreign countries

ab1883pb wrote:

has my account been breached by foreign countries

If your question is in response to a phone call, nothing has been breached.