Pentagon officials said details were still being worked out, and experts doubted Mr. Trump’s threat of huge tariffs for Russian trading partners.

Trump's moves underline his growing disenchantment with Russian President Vladimir Putin over the lack of progress in U.S.-led efforts to secure a ceasefire.

President Trump has effectively handed Vladimir Putin an extraordinary green light: 50 days to finish off his brutal summer offensive in Ukraine before facing any consequences.

Mass attack hits cities overnight as Ukrainians brace for 50 more days of Russian terror * Putin unfazed by Trump's threats, plans to fight on in Ukraine, Reuters reports * Patriot missiles bound for Ukraine already being shipped,

President Donald Trump had promised a "major statement" on Russia on Monday, and it did look like a big shift in his approach to the war in Ukraine. But significant uncertainty remains amid a lack of key details.