The first lorries with US humanitarian aid for Venezuela have arrived in the Colombian border city of Cúcuta.
The vehicles are currently parked near the Tienditas bridge, which remains blocked by Venezuelan troops.
President Nicolás Maduro, who has the support of the army, has rejected letting it into the country.
Opposition leader Juan Guaidó, who has declared himself interim president, has warned many Venezuelans are in danger of dying without international aid.
Mr Guaidó is head of Venezuela’s National Assembly and says the constitution allows him to assume power temporarily when the president is deemed illegitimate.
He has secured the backing of over 40 countries, including the US and most Latin American and European nations. Mr Maduro still has the support of China and Russia.
In other developments:
- The US announced new sanctions on members of the Maduro administration, saying visas for members of the government-controlled Constituent Assembly would be revoked
- European and Latin American members of the so-called International Contact Group said it was crucial to restore full democracy in Venezuela, saying they would push for new elections as soon as possible