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Ukraine must be ready for a full-scale Russian invasion “at any moment,” the country’s acting president warned Thursday, as officials announced the emergency call-up of a 60,000-strong national guard force.

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Oleksander Turchynov said Moscow was “ready” to go much further than the annexation of the Black Sea territory of Crimea, which is expected to vote to secede from Ukraine in a referendum on Sunday.

Only clear international pressure could halt slow the momentum of the Kremlin, he said. “All of civilized humanity supports our country,” said Mr. Turchynov. “I am sure that this united effort in the international arena, bringing together all democratic countries, can still allow us to halt this aggression.”

Washington and the international community won’t recognize the outcome of Sunday’s referendum in Crimea on seceding from Ukraine, U.S. Secretary of State John Kerry said Friday after six hours of talks with Russia’s foreign minister.