The source said that "people from Caracas" sold the coup plan to Washington, promising that the military would side with Juan Guaiido if he received outside support and began to act.
"They thought it was a 24-hour operation," he added.
The WSJ had previously reported that on the night before the proclamation of their position as interim head of state, Guayido was on the phone with US Vice President Mike Pence. The latter promised oppositionist support in the fight against Maduro. "Late call launched a plan," – said the publication.
In January, a wave of protests swept across the country against the current president, Nicolas Maduro, re-elected last March.
On January 23, Parliamentary Speaker Juan Guaiido declared himself head of state for the duration of the provisional government. This step was supported by the United States and several other countries.
The head of the Bolivarian Republic called the Guayido a puppet of Washington. Russia, Mexico, China, Turkey, Indonesia and a number of other states adhere to the same position.
The Venezuelan army continues to support Maduro.