Donald Trump says he is "very, very unhappy" with Russia and "disappointed" in President Vladimir Putin, Report informs via BBC.
The US president says he will introduce "very severe" secondary tariffs of 100% if no ceasefire deal is reached with Ukraine within 50 days.
He is meeting Nato Secretary General Mark Rutte in the White House.
Ukrainians are tentatively welcoming reports of US arms shipments, but they're also wary.
Meanwhile, Ukraine's President Volodymyr Zelenskyy says he has had "productive" talks with the US envoy to Ukraine, Keith Kellogg, in Kyiv today.
In Russia, Kremlin spokesperson Dmitry Peskov says it's "very important" talks over Ukraine continue.