Key developments on Feb. 14-15: * Ukraine destroys half of Russia's 'key' Pantsir air defense systems, security service says * Ukraine hits Russia's BK-16 landing craft in Crimea and other targets in Russian-occupied territories, military says * Zelensky, Rubio discuss air defense for Ukraine, possibility of leader-level peace talks * Territorial concessions by Ukraine won't bring peace, Zelensky says in Munich * Ukraine сonfirms strike on oil terminal in Russia's Krasnodar Krai, hits air