A UN team of experts has discovered that the Houthis were behind the December 30 attack on Aden Airport.
The attack killed 22 members of Yemen’s internationally recognized government.
According to the British news agency Reuters, two diplomats familiar with the matter said this on Monday.
The diplomats, speaking on condition of anonymity because of the sensitivity of the issue, said: “Experts submitted their report to the UN Committee on Sanctions on Yemen on Friday, but Russia blocked its implementation.”
The diplomats did not say why Russia had blocked the report, while the Russian mission to the United Nations did not respond to a request for comment.
It is thought that the Iranian-backed Houthis had denied responsibility for the attack on Aden Airport.
The report comes at a sensitive time for the new US president, Joe Biden, at a time when his administration and the United Nations are pressuring the Houthis to accept a peace offer, including a ceasefire.
The Saudi and Yemeni governments have offered peace, but the Houthis say they will not go further.
According to diplomats, UN experts discovered that the Houthis fired missiles at Aden Airport from two locations under their control at the time, one at Taiz airport and the other at Dhamar police station.
The missiles fired were similar to those used by the Houthis earlier.