The conflict in the Ukraine is not the only reason Russia is in the news. Seems that Russian hackers have stolen more than a billion unique username and password combinations, and more than 500 million email addresses, all taken from thousands of websites.
Since knowing whether you are among the millions of folk whose information was compromised may not be possible, prudent action would be to change the passwords for your email, banking information and sites containing sensitive information such as medical or financial records. It is always a good idea to have different passwords for different sites.
Always be wary of sites asking for personal information, especially in response to an email or cold call. Be sure to review your bank and credit card statements regularly; it is also a good idea to check credit reports every few months or so.