Leaders are sounding alarms about growing threats, but Chancellor Olaf Scholz is wary of pushing the Kremlin, and his own ambivalent public, too far.

Defense Minister Boris Pistorius has begun warning Germans that they should prepare for decades of confrontation with Russia — and that they must speedily rebuild the country’s military in case Vladimir V. Putin does not plan to stop at the border with Ukraine.

Russia’s military, he has said in a series of recent interviews with German news media, is fully occupied with Ukraine. But if there is a truce, and Mr. Putin, Russia’s president, has a few years to reset, he thinks the Russian leader will consider testing NATO’s unity.

“Nobody knows how or whether this will last,” Mr. Pistorius said of the current war, arguing for a rapid buildup in the size of the German military and a restocking of its arsenal.

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