The French hold was separate -- the Battle of Verdun was an offensive by the Germans, the French kept their hold. There was no plan by the Germans for breaking through, no plan to do anything but bleed the French.
There was not the "Russian involvement" you talk about rather Germany declared war on both East and West. This came about because Kaiser Wilhelm I was too arrogant to follow Bismark's plan of keeping Russia friendly to Germany -- he did not continue the Reinsurance Treaty in 1890.
the Italians fought the Austro-hungarians. The Austro-hungarians were not facing off against France, rather were fighting the Russians.
The Italian campaign involving Austro-Hungary and Italy only got German in 1917 -- after Verdun (which ended in 1916 dec)The Austrians received desperately needed reinforcements after the Eleventh Battle of the Isonzo from German Army soldiers rushed in after the Russian offensive ordered by Kerensky (Kerensky Offensive) of July 1917 failed.
Whatever. If it had been Germany vs. France, one on one, Frogs lose. Every time. Period.