Why did the Russians decide not to fight these invading armies?

The Russians often opted not to engage directly with invading armies due to a combination of strategic retreats, scorched earth tactics, and the desire to preserve their forces for more favorable conditions. Historically, this approach allowed them to draw invaders deeper into Russian territory, stretching their supply lines and morale. Additionally, harsh weather conditions and vast landscapes posed significant challenges for invading forces, further contributing to Russia's decision to avoid direct confrontation. This strategy has been evident in conflicts such as the Napoleonic Wars and World War II.