The United States is concerned about Ukrainian attacks on Russian oil refineries. Washington considers refineries to be civilian targets, states Celeste Wallander, Assistant Secretary of Defense for International Security Affairs, according to CNN correspondent Natasha Bertrand. “The issue on attacking critical infrastructure is when those are civilian targets, we have concerns,” Wallander stated, commenting on strikes against Russian oil refineries. She further noted that Ukraine holds itself to the highest standards of observing the laws of armed conflict and that is “one of the elements of …