Clearly. NATO Are Not Rational Actors.

Making it difficult to assess. Whether the US' announcement of more sanctions at , around, 2AM D.C time.

Was a measured part of what they think is their big push.

https://us.cnn.com/2022/02/28/business/russia-ruble-banks-sanctions/index.html

Or a panicked realisation that their big push has already failed.

The latter would be more in keeping with reality. However you suspect the former is the case.