US President Donald Trump has told Russia to resolve its Ukraine war within 50 days or face massive new economic sanctions as he laid out plans for new infusions of weaponry for Kyiv.
"We're very, very unhappy" with Russia, Mr Trump told reporters as he met with NATO chief Mark Rutte in the White House.
"We're going to be doing very severe tariffs if we don't have a deal in 50 days, tariffs at about 100%," said Mr Trump, adding that they would be "secondary tariffs" that target Russia's remaining trade partners - thereby seeking to cripple Moscow's ability to survive already sweeping Western sanctions.
Mr Trump and Mr Rutte also unveiled a deal under which the NATO military alliance would buy arms from the United States - including Patriot anti-missile batteries - and then distribute them to Ukraine to help it battle Russia's invasion.
"This is billions of dollars worth of military equipment ... is going to be purchased from the United States, going to NATO ... and that's going to be quickly distributed to the battlefield," Mr Trump said.
Mr Rutte, a former Dutch prime minister, said Ukraine would get "massive numbers" of weapons under the deal.
Mr Trump launched a bid at rapprochement with Mr Putin shortly after starting his second term in January, as he sought to honour his election campaign promise to end the Ukraine war within 24 hours.
His pivot towards Mr Putin sparked fears in Kyiv that he was about to sell out Ukraine, especially after Mr Trump and his team berated Ukrainian President Volodymyr Zelensky in the Oval Office in February.
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Trump expresses growing anger with Putin
But Mr Trump has shown growing anger and frustration with Mr Putin in recent weeks as the Russian leader, instead of halting his three-year invasion, instead stepped up attacks.
Mr Trump said of Mr Putin: "I don't want to say he's an assassin, but he's a tough guy."
Last week, Mr Trump had teased an announcement on Russia. He then announced at the weekend that he would send vital Patriot air defence systems to Ukraine to help it fend off escalating barrages of Russian attacks.
Washington has also U-turned from an announcement earlier this month that it would pause some arms deliveries to Kyiv.
Mr Rutte's visit to the White House is the first since the former Dutch prime minister described Mr Trump as "daddy" at a NATO summit in The Hague last month.
Moscow has unleashed record waves of drone and missile strikes over the past few weeks, with the number of Ukrainian civilians killed or wounded in June hitting a three-year high, according to UN figures.
Mr Trump's announcement came as his special envoy Keith Kellogg arrived in Kyiv to meet Mr Zelensky.
Mr Zelensky hailed the "productive meeting", saying they had discussed "strengthening Ukraine's air defence, joint production, and procurement of defence weapons in collaboration with Europe".
The Ukrainian leader also said he was "grateful to President Trump for the important signals of support and the positive decisions for both our countries".
Meanwhile, Russian forces said they had captured new territory in eastern Ukraine with the seizure of two villages, one in the Donetsk region and another in the Zaporizhzhia region.
Its forces also killed at least three civilians in the eastern Kharkiv and Sumy regions, regional Ukrainian officials announced.
In Kyiv, Mr Zelensky also proposed a major political shake-up, recommending economy minister Yulia Svyrydenko take over as the country's new prime minister.
Ms Svyrydenko said on social media that Ukraine was facing a "crucial time".
