A Kremlin spokesman has declined to comment on reports that the United States is planning to store heavy arms in Eastern Europe.
Dmitry Peskov said on June 15 that Moscow would do so only in response to an official U.S. statement.
Citing U.S. and allied officials, The New York Times reported on June 13 that Washington planned to store heavy military equipment in several Baltic and Eastern European countries to reassure allies made uneasy by Russia's action in Ukraine and to deter aggression.
Poland and Lithuania confirmed they were in talks with Washington on stationing heavy arms in warehouses in the region.
Polish Defense Minister Tomasz Siemoniak said Warsaw expects a final answer from Washington "within a few weeks."
A Russian Defense Ministry official said the planned U.S. action would amount to "the most aggressive step by the Pentagon and NATO" since the Cold War.
"Russia would be left with no other option but to boost its troops and forces on the western flank," General Yuri Yakubov was quoted as saying by the Interfax news agency.
Based on reporting by Reuters and Interfax