The US Treasury text reads in part:

Today, the United States, in coordination with allies and partners, continued to forcefully respond to Russia's unjustified, unprovoked, and premediated invasion of Ukraine by imposing sanctions on President of the Russian Federation Vladimir Putin and the Minister of Foreign Affairs, Sergei Lavrov, as well as other members of Russia's Security Council. This builds on other sweeping actions that the United States and partners took earlier this week targeting the core infrastructure of the Russian financial system, including sanctions against Russia's largest financial institutions, restricting the ability of the Government of the Russian Federation to raise capital, and cutting it off from access to critical technologies. Cumulatively, these actions impose unprecedented diplomatic and economic costs on Russia and further isolate it from the global financial system and international community.

Russian leaders including Putin himself have in past statements warned that sanctions against the sitting head of state would be seen as tantamount to an act of war.