A United Nations Security Council meeting on Venezuela’s crisis briefly turned into a diplomatic brawl on Tuesday, as the United States and Russia traded rejoinders reminiscent of the Cold War.

Nothing was resolved, and it appeared that if anything, the meeting illustrated how antagonists have hardened their positions over the crisis afflicting Venezuela, once Latin America’s most prosperous country, now in an economic free fall.

The meeting was requested by the Americans to protest the Venezuelan government’s refusal to permit humanitarian aid into the country this past Saturday, when convoys of supplies were stalled at its borders with Colombia and Brazil.

At least four people in Venezuela were killed and dozens injured in border clashes between antigovernment protesters and loyalists of President Nicolás Maduro.