What are Kalibr and Kh-101 Cruise Missiles and What's Made Them Effective in Ukraine?

NATO countries continue to climb up the escalation ladder with Russia, suppling Kiev with ever deadlier and more advanced weapons. Kiev reportedly now wants Western analogues of Russia’s best cruise missiles, the Kalibr and Kh-101. What are the missiles’ characteristics? Why does Ukraine’s military want them? Sputnik explains.