GENEVA (AP) – The United States and Russia sought to lower the temperature in a heated standoff over Ukraine, even as they said no breakthrough was imminent amid fears of a possible Russian invasion. Armed with seemingly intractable and diametrically opposed demands, U.S. Secretary of State Antony Blinken and Russian Foreign Minister Sergey Lavrov met in Geneva at what the American said was a “critical moment.” With an estimated 100,000 Russian troops massed near Ukraine, many fear Moscow is preparing an invasion although Russia denies that. The U.S. and its allies are scrambling to present a united front to prevent that or coordinate a tough response if they can’t.