Trump said the United States would put secondary tariffs on countries that do business with Russia if a peace deal is not reached in 50 days.

The president said in a meeting with NATO’s leader that Kyiv will have new weapons and air defenses within days under the agreement.

Some conservative members of Donald Trump's "Make America Great Again" movement have reacted angrily to the president's plans to sell weapons to Nato, arguing it is a betrayal of his promise to end US involvement in foreign wars.

NATO Secretary General Mark Rutte warned that Brazil, China and India will face secondary sanctions from the US if Russia doesn’t negotiate a peace deal with Ukraine, and said they should lean on President Vladimir Putin to agree to a ceasefire.

Russia launched four missiles and 136 drones into Ukraine overnight into Monday morning, according to Ukraine's air force.

Donald Trump has threatened Russia with 100 per cent secondary tariffs if the war in Ukraine does not end soon, as he announced an agreement with Nato allies to send more weapons to Kyiv.

Trump also revealed that Putin had recently offered to assist in mediating between Israel and Iran during their brief June conflict — an offer he declined. “I said, ‘No, no, you help me get a settlement with you, with Russia,’” Trump recounted. “And I think we're going to be doing that too.”

Flight data showed how American and British reconnaissance aircraft flew from England toward Russia on Monday.