CARACAS, Venezuela — Venezuela will shrink the size of the U.S. Embassy staff, limit the activities of U.S. diplomats and require American citizens to apply for visas if they want to come bask on the beach.

Speaking before a crowd that rallied to protest imperialism, President Nicolas Maduro said Saturday that "gringo" meddling had forced him to adopt the series of restrictive measures, which include requiring U.S. diplomats to seek approval from the Foreign Ministry for meetings they conduct here.

Relations between the two countries have been rapidly deteriorating as Maduro blames U.S. plotting for the host of economic and social woes plaguing the socialist-governed country. He recently accused the U.S. of working with local opposition groups to stage a coup that involved bombing the presidential palace. Washington called the accusation ludicrous.

The two countries have not exchanged ambassadors since 2010, but have continued to exchange diplomatic staff. On Saturday, Maduro said the U.S. has far more officials in Venezuela than his government has in the U.S.

Maduro addressed Obama directly, saying the U.S. president has "arrogantly" refused to engage in conciliatory talks.

"I'm very sorry, Mr. President, that you have gone down this dead end," he during a speech that all Venezuelan television and radio stations were required to carry.

Maduro said he was imposing the new tourist visa requirement for national security reasons, saying that in recent days authorities had detained several U.S. citizens who he alleged were involved in espionage, including an American pilot.

Earlier in the day, Venezuela released four missionaries from North Dakota who had been detained several days ago for unknown reasons. They were banned from coming back for two years.

Venezuela will charge Americans the same tourist visa fees that the U.S. charges Venezuelans and it will require payment in dollars, which are increasingly scarce in Venezuela. Maduro said all comers would be welcome, except for a few selected U.S. officials, who would be banned from the country, including former President George W Bush and Republican Sen. Marco Rubio of Florida.

The U.S. State Department declined to comment on the new restrictions, which come after the U.S. recently imposed a travel ban on a list of top Venezuelan officials accused of human rights violations.

Americans have been staying away from Venezuela as crime has soared, exchange rates have become difficult to navigate and Maduro has stepped up attacks on the U.S. government. Just 36,000 U.S. citizens visited in the first nine months of 2014, about half the number that visited two years earlier, according to Venezuela Tourism Ministry data. Overall, some 950,000 foreigners visited Venezuela last year.

The move could have a bigger impact on business travelers than holiday-goers. As one of the world's largest oil producers, Venezuela remains an important destination for executives, and the new restrictions could affect U.S. companies investing here.

Maduro also announced that he was cancelling a trip to Uruguay, where he had been expected to celebrate the inauguration of a fellow leftist politician as president. He cited the "political situation" in Venezuela.

Earlier in the day, Venezuelans took to the streets of Caracas in dueling demonstrations, with one group calling attention to a crackdown on government opponents and another showing support for the embattled socialist administration.

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Government supporters marched to the presidential palace to express their rejection of imperialism and commemorate the 26th anniversary of a convulsion of violence in Caracas widely seen by government backers as evidence of the brutality of pre-socialist administrations.

Opposition activists, meanwhile, gathered to denounce the arrest of Caracas Mayor Antonio Ledezma earlier this month and the death on Tuesday of a teenager who was shot during an anti-government protest.

In San Cristobal, where the 14-year-old was fatally shot during an anti-government protest, thousands of people massed in the streets of the Andean town known for sparking the country's protest movements.

Hannah Dreier on Twitter: https://twitter.com/hannahdreier

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