President Joe Biden warned President Vladimir Putin of Russia that invading Ukraine would result in “swift and severe” costs to Russia, diminish his country’s standing and cause “widespread human suffering,” the White House said Saturday as Western officials made a forceful diplomatic push to dissuade Putin from pressing forward with an attack.

It remained uncertain whether Putin would invade, according to senior Biden administration officials. But after the call, one official said that the situation remained as urgent as it was Friday when the administration said Russia could invade at any moment and Jake Sullivan, the president’s national security adviser, warned Americans to leave the country in the coming days.

White House officials said that Biden discussed a range of diplomatic options with Putin but that it was unclear if Putin was persuaded to take that route.