Russia is preparing military countermeasures in response to the planned American deployment of longer-range missiles in Germany, the Russian deputy foreign minister said on Thursday, adding that the U.S. move was “destructive to regional safety and strategic stability.”

“Without nerves, without emotions, we will develop a military response, first of all, to this new game,” the deputy minister, Sergei A. Ryabkov, told Interfax, a Russian news agency.

In a separate comment published by the Russian Foreign Ministry, Mr. Ryabkov said that Moscow had anticipated the decision and that Russia had started preparing “compensating countermeasures” in advance.

In a joint statement, the United States and Germany said Washington would begin “episodic deployments” of the missiles in Germany in 2026, including those that are “significantly longer range” than the ones currently deployed throughout Europe.

The statement said that the periodic deployments would be preparation for “an enduring stationing of these capabilities in the future.” Ultimately, the weapons will include nonnuclear SM-6 missiles, Tomahawk cruise missiles and developmental hypersonic weapons, the statement said.

The move had echoes of the Cold War, when Moscow and Washington undertook competing missile deployments, with American allies in Europe caught in between.