German Chancellor Olaf Scholz sees military failures in Russia’s war against Ukraine as the reason for President Vladimir Putin’s decision to mobilize hundreds of thousands of reservists. “All this can only be explained against the background of the fact that the Russian attack on Ukraine has not been successful,” a government spokesman quoted Scholz as saying in Berlin on Wednesday. The Russian military had been forced to regroup after withdrawing from Kiev and failing to achieve the desired outcome in eastern Ukraine, the spokesman said. “This is a visible sign that Ukraine is very effective…