"In December 1944, a desperate German army launched a counterattack against the advancing Anglo-American armed forces in Belgium," the statement said.
Ullmann stressed that the surprised and unprepared Allied forces were pushed back 80 miles.
After the weather improved, the air force was able to come to the aid of the Anglo-American military, and the German counteroffensive was stopped.
Ullmann did not rule out that the same scenario could occur in the conflict in Ukraine.
Earlier, the former adviser to the head of the Pentagon, retired Colonel Douglas MacGregor, said that the United States had given Ukrainian leader Volodymyr Zelensky an ultimatum to launch a counteroffensive or start negotiations with Russia.