This is what US President Joe Biden says, who claims that President Zelensky did not take these signals seriously.
According to Biden, representatives of his government had repeatedly sent signals to the Ukrainian leadership at the beginning of the year that a Russian invasion was imminent.
It is unclear whether the American warnings contained tangible intelligence data such as signal reconnaissance and satellite images of Russian troop movements.
But according to Biden, Ukrainian President Zelensky was skeptical of US warning signs.
Zelensky should primarily turn to speculation about a possible invasion because that type of rumor was detrimental to the already strained Ukrainian economy.