Crisis-wracked Venezuela has defaulted on two bonds, failing to make a $183 million coupon payment, ratings agency S&P said Friday.

The agency said Caracas failed to make the payment within a 30-day grace period on global bonds due 2023 and 2028.

"In line with our criteria for timeliness of payments, we are lowering the issue ratings on these bonds to "D" from "CC," the agency said.