That means little green men.

Russia could send “little green men” to test NATO’s resolve, German intelligence boss warns – Russia is determined to test the resolve of the NATO alliance, including by extending its confrontation with the West beyond the borders of Ukraine, the Germany’s foreign intelligence chief told the Table Media news organization.

Bruno Kahl, head of the Federal Intelligence Service, said his agency had clear intelligence indications that Russian officials believed the collective defence obligations enshrined in the NATO treaty no longer had practical force…

Without detailing the nature of his intelligence sources, Kahl said Russian officials were envisaging confrontations that fell short of a full military engagement that would test whether the U.S. would really live up to its mutual aid obligations under Article 5 of the North Atlantic Treaty.

“They don’t need to dispatch armies of tanks for that,” he said. “It’s enough to send little green men to Estonia to protect supposedly oppressed Russian minorities.”