Ukraine's audacious invasion of Russian territory is a massive blow to Putin's power

• Ukraine's military invaded Russia's Kursk region on Tuesday.
• The Kremlin initially downplayed the attack.
• But analysts said it's an embarrassment to Russia's strongman president, Vladimir Putin.

When Ukraine launched its audacious cross-border attack in Russia's Kursk region on Tuesday, the Kremlin initially downplayed the incursion, attributing it to a "sabotage and reconnaissance group."