So why such decision, why this is one of the first moves by US government in the topic of Ukraine
Its not really "one of the first moves"; I guessed you missed the US: not sending a presidential delegation to the Paralympics, initiating two rounds of sanctions by executive order, cancelling a broad array of contacts through NATO (as well as a number of other acts through NATO), participating in reverting the G8 back to the G7, participating in the decision at OECD to stop Russia's accession process there, participating in the UNGA vote declaring Russia's actions illegal, etc.
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Its not really "one of the first moves"; I guessed you missed the US: not sending a presidential delegation to the Paralympics, initiating two rounds of sanctions by executive order, cancelling a broad array of contacts through NATO (as well as a number of other acts through NATO), participating in reverting the G8 back to the G7, participating in the decision at OECD to stop Russia's accession process there, participating in the UNGA vote declaring Russia's actions illegal, etc.