Fancy Bear and Cozy Bear are code names for two incredibly sophisticated, secret and above all RUSSIAN spying organisations. They may try to hack their way into your gmail account. You need to protect yourself so BE AWARE of how they operate.
First, they send you an email (which cyberspying experts call a "phishing email") telling you that there has been an attempt at unauthorised access to your gmail account and advising that you re-set your Password.
Second, you reply, re-setting your Password.
Third, they login to your gmail account, copy all your mails and PUBLISH them
Er, that's it.
It worked against the Democratic National Committee so it may work against you or CIA Headquarters or FBI headquarters ....