For now, they will most likely treat it like they did with delta, by banning direct travel from the source(like that helped), and wait out the results from testing vaccine efficiency on that variant. Once they saw 2 dose offered protection against delta, they stopped caring. When delta came out, everyone panicked as well, thinking vaccines would be useless, so panic is just useless at this point. My worry is only if they will start baning other countries meanwhile, if comunity transmission starts elsewhere. A good study will probably take at least 30 days.