(CNN) Nicolas Maduro will close Venezuela's border with Brazil, as tensions over foreign aid deliveries rise. The embattled President also is considering closing the border with Colombia -- a move that would seal off most of Venezuela's inland periphery.

In a televised speech Thursday, Maduro announced the Brazil border closure and warned against trying to bring humanitarian supplies into Venezuela by force. "I don't want to make such a decision, but I am considering it -- an absolute closure of the border with Colombia," he said. "We have taken all the measures so that everything can be peaceful," he added.

Foreign aid is currently being assembled in both Brazil and Colombia, at the call of Venezuelan opposition leader and self-declared president Juan Guaido. While he accepted aid from the United Nations last year, Maduro opposes the new aid shipments and has described the opposition's aid campaign as "a provocation."

Guaido has named Saturday as the deadline for the aid to cross the border.

Venezuela has already closed its air and maritime borders with Curacao , Guaido's third declared collection point for humanitarian aid, as well as the islands of Aruba and Bonaire.

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