US President Joe Biden has said he thinks his Russian counterpart Vladimir Putin will "move in" on Ukraine but does not want "full-blown war".
He told a news conference Mr Putin would pay a "serious and dear price" for invading, but indicated a minor incursion might be treated differently.
The White House later stressed any Russian military move would be met with a swift, severe response from the West.
The Kremlin warned the comments could further destabilise the situation.
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L'informazione della testata giornalistica di LA7 diretta da Enrico Mentana