US Ambassador to the UN Linda Thomas-Greenfield attends the Summit for Democracy in San Jos on March 30, 2023. AFP
"Russia is a permanent member of the Security Council. It shouldn't be, because of what it is doing in Ukraine, but the (UN) charter does not allow for a change in its permanent membership," Thomas-Greenfield said on Thursday from Costa Rica, where she was attending a democracy summit.
Russia is also set to assume the rotating presidency of the Security Council on Saturday for a month.
The US ambassador said she expects Russia to behave "professionally" in the presidency, but expressed doubts.
"We also expect that they will also seek opportunities to advance their disinformation campaign against Ukraine, the United States, and all of our allies," she said.
"At every opportunity, we will raise our concerns about Russia's actions," she added, reiterating Washington's condemnation of Moscow's "war crimes and human rights violations" in Ukraine.
Regarding the diplomatic battle between China and Taiwan, Thomas-Greenfield said Washington respected the "One-China" policy, but stressed the United States and Taipei had a "strong partnership".
Last weekend, Honduras established diplomatic relations with China, breaking ties with Taiwan.