U.S. President Donald Trump said on Tuesday he was not happy with Russian President Vladimir Putin and was considering additional sanctions on Moscow, underscoring his frustration over the growing death toll in Russia's war with Ukraine.

In a dramatic shift in tone, Trump accused Putin of spewing double talk on Ukraine and sounded far more supportive of embattled Kyiv.

The president also acknowledged that his plan to cajole Russia's president into ending the war in Ukraine has "turned out to be tougher."