United States Ambassador to the United Nations Nikki Haley aims to put to a vote within weeks a U.N. Security Council resolution to impose stronger sanctions on North Korea over its long-range ballistic missile test, said several senior U.N. diplomats.

Haley told some U.N. diplomats late last week of the ambitious timeline for a U.N. response to North Korea’s launch on Tuesday of a missile that some experts believe could have the range to reach Alaska, and parts of the U.S. West Coast.

The U.S. mission to the United Nations declined to comment on the timeline for a council vote. Some Security Council diplomats have expressed doubt that a draft resolution could be put to a vote quickly.

Following a nuclear weapons test by North Korea in September, while U.S. President Barack Obama was still in office, it took the U.N. Security Council three months to agree to strengthened sanctions.