Inside the country, opposition figurehead Juan Guaido, 35, is vying to lure military commanders to switch their allegiance to him away from President Nicolas Maduro, 56.
Spain had earlier become the first leading European Union country to recognize Guaido as interim president as European Union pressure on Maduro increases.
United Nations Secretary General Antonio Guterres said he was available to facilitate negotiations between the rival sides in Venezuela.
"I swear ... that I will defend with my life this fatherland under threat", Maduro said at an event in Aragua state in the north, commemorating the 27th anniversary of a failed coup by his late predecessor Hugo Chavez. Those who continue to violate the human rights of ordinary Venezuelans under an illegitimate regime will be called to account. Sweden, Denmark, Austria, the Netherlands, Lithuania, Finland, the Czech Republic and Portugal also lined up behind Guaido, the self-declared interim president who also has the support of the United States and many South American nations.
The global pressure on Venezuelan leader Maduro intensified on Monday as a host of European Union nations declared his rival Guaido as interim president. "We are looking at what further steps we can take to ensure peace and democracy in Venezuela including through sanctions".
Osaka wins first set against Kvitova in Australian Open final
Like right after, the day after, I really didn't want to think about it because it wasn't necessarily the happiest memory for me. Osaka is a young, up-and-coming star who proved she's here to say, whereas Kvitova overcame the odds to make it back.
"The coward government of Spain has made a awful decision in the history of relations between Spain and Venezuela".
The United Nations will not join any group of nations promoting initiatives to resolve the crisis in Venezuela, the UN chief said Monday, indicating he will not attend a meeting in Uruguay this week of several countries.
Russian Federation also accused European nations of meddling in the Venezuela crisis.
The situation has always been denounced by the opposition and Guaido stunned the world on January 23 when he declared himself acting president at a rally, declaring Maduro's presidency "illegitimate" and founded on flawed elections.
Maduro, who has overseen an economic collapse and the exodus of millions of Venezuelans, maintains the backing of Russia, China and Turkey, and the critical support of the military.
Maduro said Monday he has written to Pope Francis asking for help in fostering dialogue.
Kamala Harris opens presidential bid
Just three months before announcing that she is jumping in the ring, she was asked directly about the question. The first-term senator has been billed as one of the Democrats' best chances for defeating Trump in 2020.
The Vatican didn't immediately respond to a request for comment on Maduro's appeal.
Trump warned that military intervention remains "an option" for dealing with the crisis in Venezuela.
Theories about a potential US military incursion into Venezuela multiplied after US National Security Adviser John Bolton was spotted with a notepad that mentioned "5,000 troops to Colombia".
"This does not contribute in any way to the peaceful, effective and vital settlement to the crisis, which Venezuelans are enduring and who should, as we believe, pull through it on their own", the Kremlin spokesman noted.
Mr Guaido, who leads the National Assembly, declared himself caretaker leader last month in a move splitting worldwide powers and bringing Venezuelans onto the streets.
Maduro has rejected a US -backed effort to send emergency food and medicine into Venezuela.
The Resident Evil 2 1-Shot Demo Hits New Milestone
Capcom is hoping to make this mode as replayable as possible, though there is no mention of whether multiplayer will be included. The Resident Evil 2 Remake launch trailer has everything you need to get your fix of the latest start-of-apocalypse story.
Alibaba earnings top estimates but revenue misses
The earnings report came a day after several companies operating in China sounded warning bells over Asia's largest economy. That compares with an estimate for revenue of 118.9 billion yuan (€15.40 billion) from 31 analysts polled by Refinitiv.
Kamala Harris Vows to Get Rid of Private HealthCare
When questions began to swirl over her impartiality, Harris has become keen to distance herself from the former mayor. If elected, she would become the first African American woman president in USA history.
PSG worry after Neymar leaves injured and crying
PSG has two big games coming up against Manchester United , on February 12 in Old Trafford and in Paris on March 6. Initial examinations have revealed a painful recurrence of his injury to the fifth metatarsal of his right foot .
Super Blood Wolf Moon Eclipse Was Super Awesome
At the peak of the spectacle, sunlight passed through Earth's atmosphere and lit the moon, making it appear to glow red. FULL moons and lunar eclipses have always been associated with various legends, myths and dark apocalyptic theories.
Missing boy, 3, found alive in North Carolina
Breanna Hathaway , who identified herself as Casey's aunt, said the boy told the family he was with a bear for two days. Professionally trained searchers will continue to work overnight. "Casey has been found alive".
Patriots invite fans to Super Bowl send-off rally
Quinton Peron and Napoleon Jinnies will make history next month when they appear on the Super Bowl sidelines. Under research, Ace pasted the official NFL regulations for properly inflated footballs for game usage.