No shots were fired.
The man was filming himself walking around the store pushing a cart when the store manager pulled the fire alarm to warn customers to escape.
Officers took the man into custody "without incident" after a store patron - identified by the Associated Press as an off-duty firefighter - held Andreychenko at gunpoint outside the building, according to authorities.
Police reportedly arrived on the scene within three minutes of receiving the call. "As Justice Oliver Wendell Holmes famously explained, 'the most stringent protection of free speech would not protect a man in falsely shouting fire in a theatre causing a panic, '" wrote Greene County Prosecuting Attorney Dan Patterson.
"His intent obviously was to cause chaos here, and he did that", Lucas said.
Twenty-two people were killed.
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An FTC spokesman said only that "investigations are non-public, and we don't comment on ... the existence of an investigation". A federal safety regulator demanded last fall that Tesla stop claiming the Model 3 is the safest auto ever tested.
Andreychenko went on with his plan anyway and is now looking at a felony charge of making a terrorist threat in the second degree.
Police did not immediately offer further details about the nature of the possible charge and said no further information would be available while the case is under prosecutorial review. He is being held on "suspicion of first-degree making a terrorist threat" at Greene County Jail.
Police said there is no longer a threat to the community and the Walmart has since reopened.
According to police in Springfield, Missouri, officers were dispatched to a Walmart this afternoon for a report of an armed man.
Andreychenko said he was surprised by other customers' reactions, telling investigators, "This is Missouri". No charges have yet been filed, but Lt. Lucas assured, "We definitely have some crimes here". No one was injured.
The rifle he carried had a loaded magazine, but a round was not chambered; and the handgun was loaded with a round in the chamber, the probable cause document said.
Since January 2017, Missouri has not required a permit to openly or hide carry a firearm for those 19 years or older.