U.S. President Donald Trump said on Friday that in two weeks he should know whether progress is possible in his bid to end Russia's invasion of Ukraine and he again raised the prospect of imposing sanctions on Moscow.

For years, Donald Trump criticized presidents for empty threats. He often pointed to then-President Barack Obama failing to enforce his “red line” on Syria using chemical weapons. During his first term in 2017, Trump called it a “blank threat” that cost us “in many other parts of the world.”