U.S. President Donald Trump said Russia has yet to respond to his ultimatum demanding a cease-fire in Ukraine, warning that Moscow will face additional tariffs and sanctions if it does not change course before an Aug. 8 deadline. The measures would target Russian exports and extend to countries that continue purchasing Russian oil and gas, a list headed by China and India. Russian President Vladimir Putin, speaking in Moscow on Friday, signaled no shift in policy. He said the Kremlin still favors further peace talks but claimed battlefield momentum remains in Russia’s favor, citing the Defence Ministry’s assertion that its forces captured the eastern Ukrainian town of Chasiv Yar after a 16-month fight — a claim Kyiv disputes. The standoff heightens diplomatic and economic pressure as the war enters its fourth year. Failure to meet Washington’s deadline could widen trade rifts and complicate efforts to revive negotiations, underscoring the limited progress since Istanbul talks began in May.