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Cuba and other nations with ties to Caracas "realize that they cannot continue to get the very, very, very reasonable rates on loans and oil and things like that at the cost they get it," said the head of US Southern Command, General John Kelly, who oversees US forces in South America.
"I don't think probably Venezuela can sustain that," Kelly told the House Armed Services Committee.
Cuba and other states that have benefited from Caracas's assistance were "nervous" about the future after the death of Venezuela's president, Hugo Chavez, on March 5, the general said.
With Venezuela's presidential elections set for April 14, Kelly said "anyone that is elected would have to rethink the flow of money that goes out of the country to essentially buy friends."
For more than a decade, Cuba has relied heavily on cheap Venezuelan oil and favorable terms of trade to keep its economy afloat.
Kelly said Vice President Nicolas Maduro was expected to defeat Henrique Capriles in the April vote but said he would face a daunting task with a troubled economy while lacking Chavez's charimastic appeal.
The next president would inherit a country with "very, very high crime, high murder rates," and its "economy is faltering" while the oil industry badly needed investment, the four-star general said.