The officials said yesterday it was not immediately clear whether Moscow intended to boycott the summit itself or was just temporarily showing displeasure over Washington's harsh condemnation of Moscow's role in Ukraine unrest and the US lead in orchestrating Western sanctions and other punitive measures in response.
But even if short-term, Russia's no-show is significant.
The US president initiated a string of summits in 2010 aimed at preventing terrorists from getting their hands on weapons-grade nuclear material.
Since then, the number of countries that have enough material to build a nuclear weapon has fallen from 39 to 25.
At the last summit this year in The Hague, 35 countries pledged to turn international guidelines on nuclear security into national laws and open up their procedures for protecting nuclear installations to independent scrutiny.
At the same time, there were setbacks. Russia was notably absent from the 35-nation agreement, along with China, India and Pakistan, all nations with nuclear weapons.
The officials, who demanded anonymity because their information was confidential, said that with the exception of Russia, all of the 54 countries that participated in the March summit attended the preparatory meeting in Washington.
Patrick Ventrell, a spokesman for the National Security Council at the White House, said the US regretted the Russian decision not to attend.
Russian government offices that could comment were closed for the night.
Moscow's absence from the next summit would clearly encourage other nations skeptical of the US initiative to resist more international oversight of their nuclear facilities.
But nuclear analyst Kenneth Luongo said that even if Moscow shows up in 2016, its boycott of planning meetings "sends a terrible signal and reflects horribly on the Russian priorities.
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