After a week abroad trying to build support for his claim to the presidency, Venezuela's opposition leader Juan Guaidó said he plans to re-enter the country on Monday.

Guaidó announced his impending return on Twitter, also calling for demonstrations throughout the country as he continues to pressure President Nicolás Maduro to cede power. Guaidó has declared himself interim president of Venezuela, and he has the support of several western countries including the United States.

His return to Venezuela could precipitate a direct confrontation with Maduro, who will face the choice of whether to arrest Guaidó or whether to let the challenge to his authority continue unimpeded. If the Maduro government does try to arrest him, Guaidó said in a broadcastSunday night, "it will be the last mistake they make," Reuters reported.

If Maduro's forces do try to detain him, Guaidó said, he has left a "clear path" for his allies to follow, tellinghis supporters they are "stronger than ever," and that now is not the time to back down.

Guaidó calledon supporters to take to the streets at 11 a.m. local time for nationwide protests. Demonstrations are expected in Caracas and at other locations throughout the country.

In an interview with the Washington Post on Sunday, Guaidó said he saw multiple scenarios that could lead to the ouster of Maduro without the use of external force. "First, that an election is allowed to take place in a free and transparent manner. That's what we're working for as soon as possible."

Also, he said, "there is an option where the military could get on the side of the constitution and of Guaidó and of the resistance, and it could stop the usurpation. That's the option that uses force, but it comes from within."

Guaidó told the Post he has offered amnesty guarantees to military and civilians who are part of the Maduro regime and "who are willing to help restore democracy in Venezuela."

When he decided to tour Latin American allies to gin up support, Guaido ignored a travel ban put in place by a Venezuelan court. Experts are uncertain what will happen once Guaidó returns. If Maduro doesn't have him arrested, they say, he could appear weak; if Maduro does arrest him, that could quell the opposition — or it could strengthen international condemnation and potentially provoke military action.

"Any measure that could put at risk Juan Guaidó's freedom, safety or personal integrity would represent a major escalation of tensions and meet the firm condemnation of the international community," said EU foreign policy chief Federica Mogherini, according to The Associated Press.

"The two of them are between a rock and a hard place," saidformer Venezuelan ambassador to the U.S. and former interior minister Ignacio Arcaya, who believes Maduro is likely to arrest Guaidó.

"If he arrests him, the world pressure will pull him out of jail pretty soon," Colombian President Iván Duque told the Washington Post. "But if he decides to do something nasty, nobody inside of Venezuela would support him. It would be like Nero burning Rome."

Russian politician Valentina Matviyenko told Venezuelan leadership that Russia is concerned the U.S. is looking for any kind of incitement "to provoke bloodshed" and to justify military intervention in Venezuela, according to Russian news service TASS. Russia backs Maduro's claim to the presidency.

During an interviewwith RT, Venezuela vice president Delcy Rodriguez would not rule out criminally prosecuting Guaidó upon his return to Venezuela. Plotting to topple the government is against the law, she said, and Venezuelan authorities "are already taking the necessary measures and will continue to protect our state of law and order."

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