The White House on Thursday warned that the Russian army is on the brink of capturing the eastern Ukrainian city of Avdiivka, after months of fighting. “Avdiivka is at risk of falling into Russian control,” White House Communications Director John Kirby said in Washington. “In very large part, this is happening because the Ukrainian forces on the ground are running out of artillery ammunition,” he said in a press briefing. Russia is sending waves of conscripts to attack Ukrainian positions. As the US Congress has not yet passed supplementary legislation for further aid to Ukraine, the urgently…