(CNBC) U.S. stocks were mixed on Friday, with the S&P 500 still managing a record close and equities posting a monthly gain.
Rumors about possible Russian action in the Ukraine were cited as a potential factor in stocks pulling back late in the session.
The Wall Street Journal, quoting Russia's Interfax news agency, reported Ukraine's acting president claimed Russia sent troops to Crimea and seized Parliament. This followed unconfirmed reports from the BBC and AFP that Russian troops may have entered Crimea.
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