International efforts to defuse the standoff over Ukraine intensified Monday, with French President Emmanuel Macron set to hold talks in Moscow and German Chancellor Olaf Scholz in Washington to coordinate policies as fears of a Russian invasion mount.

The concentration of an estimated 1,00,000 Russian troops near Ukraine has fueled Western worries that it heralds a possible offensive. White House national security adviser Jake Sullivan warned Sunday that Russia could invade Ukraine “any day,” triggering a conflict that would come at an “enormous human cost.”