Russia is finding gaps around the air defenses of Ukraine's best-protected city

• Russian attacks have knocked out a major power plant near Kyiv. 
• The Ukrainian capital was once shielded from Russian attacks. 
• But it's running desperately short of air defense missiles. 

Russia has taken out a major power plant near the Ukrainian capital, Kyiv, in a sign that even the country's best-protected cities are increasingly vulnerable to Russian attacks.

The Trypillya power plant, which is around 30 miles south of Kyiv and is the region's major power plant, was destroyed Thursday by Russian drone and missile attacks.