Acountry allied with austria declared war on two strong countries of the triple entente?

The German Empire and Austria-Hungary were Allied within the Central Powers, So I assume it was the German Empire in this case, Which Declared war on Russia and France and was at war with Britain due to the Invasion of Belgium.

So the Answer is the German Empire.

It is false

Explanation:

Julius and Ethel Rosenberg were arrested in the Summer of 1950 and executed in 1953, they were convicted of conspiring to commit espionage by passing plans for the atomic bomb to the Soviet Union.  Harry S. Truman  was the president at that time.