First the US has to get 9 votes and they are very possibly not there. Second, the US has just angered the Russians by putting missiles on their borders. At the least Russia will vote no or abstain or could just veto. Third, the US is trying to isolate and embarrass China . In response, China will ensure that the US is publically humiliated in the worst way possible. China may even ensure that Clinton will be forced to resign in shame. The Chinese play for keeps and thinking you can outsmart the Chinese is a stupid, losing proposition. The Chinese are quiet but deadly.
U.S. says it killed 10 AQAP Islamist militants in four air strikes in Yemen since April 23 (Reuters)
from the article: U.S. officials: Expect new Iran sanctions by late March, early April