The four nations [UK, the US, France, Germany] say they "abhor the attack".

The statement says: "It is an assault on UK sovereignty and any such use by a State party is a clear violation of the Chemical Weapons Convention and a breach of international law. It threatens the security of us all."

Then...

https://edition.cnn.com/2018/03/15/politics/russia-sanctions-trump-yevgeniy-viktorovich-prigozhin/index.html

The Trump administration announced Thursday it is enacting new sanctions on Russia, including individuals indicted last month by special counsel Robert Mueller, in a sweeping new effort to punish Moscow for its attempts to interfere in the 2016 US election.