MOSCOW, May 6 (Reuters) - The assets of Russia's National Wealth Fund (NWF) stood at the equivalent of $138.9 billion as of May 1, or 7.1% of the country's gross domestic product (GDP), compared to $135.7 billion on April 1, the finance ministry said on Monday.

The fund's liquid assets totalled the equivalent of $56.4 billion, or 2.9% of projected GDP, up from $55.1 billion a month earlier, the ministry said.

(Reporting by Darya Korsunskaya; editing by Guy Faulconbridge)