Mr Maduro is doing more or less what is expected of him - following his own inner voice, rather than listening to anyone outside of Venezuela (and particularly nobody in Washington since 2002 or before if we include the Chavez years).
What that means to me is that if the US uses rhetoric to try and convince him that this move into Guyana is not in his interests, someone will have
to show him rather than tell him. (And if China tells him "don't" or if Russia tells him "don't' perhaps there would be a different response. Not sure).
A WSJ article on Mister Maduro is probably more US politics-ish, so I'll spoiler it (actually, just an excerpt) but I think it applies to this case in terms of
who can apply persuasive means to convince him not to do this.
Apparently, one of the major South American nations, Brazil, isn't going to be heeded in terms of advising him not to do this.
Well, that was predictable. On Nov. 30 the Maduro regime in Venezuela ignored the U.S. deadline to lay out a process to reinstate opposition candidates for a 2024 presidential election.
In return for that Maduro promise, made Oct. 17 with the democratic opposition, the Biden Administration eased sanctions for six months on the export of Venezuelan oil and new investment in the country. The U.S. also lifted bans on dealing with the government-owned mining company and on trading some Venezuelan securities.
At the time Secretary of State Antony Blinken said that the U.S. had “conveyed our expectation and understanding that” by Nov. 30 Venezuela would “define a specific timeline and process for the expedited reinstatement of all candidates” who had been banned from running. He added that opposition candidates had the right to run on “a level electoral playing field” that includes “freedom of movement” and guarantees of “their physical safety.”
He also said that Venezuela had to “begin the release of all wrongfully detained U.S. nationals and Venezuelan political prisoners.” Mr. Blinken warned that “failure to abide by the terms of this arrangement will lead the United States to reverse steps we have taken.”
The Blinken deadline passed on Thursday. Venezuela released five political prisoners in October but it still holds some 270, including three Americans that the State Department deems wrongfully detained. The regime also hasn’t reinstated banned presidential candidates, including the popular Maria Corina Machado.