MOSCOW (AP) — Some airlines have canceled or diverted flights to Ukraine amid heightened fears that an invasion by Russia is imminent despite intensive weekend talks between the Kremlin and the West. In an hourlong Saturday call with Russian President Vladimir Putin, President Joe Biden said that invading Ukraine would cause “widespread human suffering” and that the West was committed to diplomacy to end the crisis but “equally prepared for other scenarios,” the White House said. It offered no suggestion that the call diminished the threat of an imminent war in Europe. The two presidents spoke a day after Biden’s national security adviser, Jake Sullivan, warned that U.S. intelligence shows a Russian invasion could begin within days. Russia denies it intends to invade but has massed well over 100,000 troops near the Ukrainian border and has sent troops to exercises in neighboring Belarus. U.S. officials say Russia’s buildup of firepower has reached the point where it could invade on short notice. Dutch airline KLM has canceled flights to Ukraine until further notice, the company said Saturday. Dutch sensitivity to potential danger in Ukrainian airspace is high in the wake of the 2014 shooting down of a Malaysian airliner over an area of eastern Ukraine held by Russia-backed rebels. All 298 people aboard died, including 198 Dutch citizens.