Ukrainian troops have switched from offensive to defensive posture and aim to exhaust advancing Russian forces, Commander-in-Chief Oleksandr Syrskyi said in an interview with German ZDF channel, published on Feb. 13. According to Syrskyi, Russian troops are attacking along the entire front line. He describes the situation as “difficult” and “quite tense.” The General Staff of Ukraine’s Armed Forces reported that as of Feb.13 Russian forces are trying to advance in the Lyman, Bakhmut, Marinka, Avdiivka, and Zaporizhzhia sectors in the east and south of Ukraine. Read also: Fate of Avdiivka uncer…