"The close US troops are to our borders, the greater the danger is for us," Peskov told reporters, adding that based on this, Russia will build a policy of ensuring its own security.
Such movements of US troops near the borders of Russia "do not lead to the strengthening of predictability and stability" in the region, the official added.
US media reported last week that 4,600 soldiers from the US Army's 101st Airborne Division and some heavy equipment had been deployed to Romania for the first time in almost 80 years to defend against any attack on NATO amid the Russia-Ukraine conflict.
Earlier, National Security Council spokesperson John Kirby said that nothing has changed in US President Joe Biden’s position that there will be no American troops fighting inside Ukraine.