Dec 1 (Reuters) - Venezuela's President Nicolas Maduro is running out of options to step down and leave his country under U.S.-guaranteed safe passage, following a short call with U.S. President Donald Trump last month where Trump refused a series of requests from the Venezuelan leader, according to four sources briefed on the call.

Venezuelan President Nicolás Maduro appears even more isolated this week after losing two regional allies, Honduras and St. Vincent and the Grenadines, at the polls as he confronts Washington’s naval buildup in the Caribbean.

President Trump delivered an ultimatum to Venezuelan leader Nicolás Maduro, demanding immediate resignation and safe passage for his family or face consequences.

Venezuelan President Nicolas Maduro on Wednesday confirmed he held a "respectful and cordial" phone call with U.S. President Donald Trump about 10 days ago, framing the conversation as a potential opening for diplomacy.

Far from supposedly surrendering, Maduro has appeared in public dancing and encouraging Venezuelans to work and party. He called the United States’ recent. actions "psychological terrorism" and has shown no signs he intends to give in to the Trump administration’s pressure campaign to resign.

The president has warned that the United States could soon expand its attacks from boats near the coast to targets inside Venezuela, but he has also spoken by phone to its leader.

Trump has overseen a large military build-up in the Caribbean under his war on the drug cartels—and Venezuela is in his sights.

The Trump administration has been weighing Venezuela-related options to combat what it has portrayed as Maduro's role in supplying illegal drugs that have killed Americans. The socialist Venezuelan president has denied having any links to the illegal drug trade.

Venezuela halts deportation flights as Trump escalates military pressure on Maduro government, ending key cooperation between Washington and Caracas.

Venezuelan President Nicolás Maduro has grown increasingly paranoid of US airstrikes following recent threats from the Trump administration, with the dictator no regularly rotating his sleeping