Moscow says it will take steps to respond if NATO begins regular troop rotations in the easternmost NATO-member countries.
Russia's permanent mission to NATO said via Twitter on August 27 that Russia's reaction would be "with a view to ensure its security."
The remarks come after NATO Secretary General Anders Fogh Rasmussen announced the troop rotations for NATO's eastern members in an interview published on August 26 by Britain's "The Guardian" newspaper.
Rasmussen said the troops rotations would be carried out at "very high frequency" so that "any potential aggressor" would know an attack on the NATO host country would target the entire NATO alliance.
Poland and the three Baltic states -- all NATO members -- have called for a stronger NATO presence after Russia's intervention in Ukraine and annexation of Crimea.