Russia's Black Sea Fleet has taken hits, but intel says military leaders may be more worried about an airbase attack near Moscow

• Ukraine has relentlessly targeted the Black Sea Fleet based in occupied Crimea in recent days. 
• But Western intel says Russia may be more worried about recent explosions at a Moscow-area airbase.
• Several military aircraft were blown up at the Chkalovsky base earlier this week, Kyiv said.

Ukrainian forces have relentlessly targeted Russia's Black Sea Fleet over the last two weeks, but a recent attack at an airbase closer to home may have Moscow's military leadership more concerned.