Mr. Putin claimed that Kyiv’s response would shed light on Ukraine’s “desire, and, indeed, its ability” to take part in negotiations to end the war. President Volodymyr Zelensky of Ukraine referred to the announcement as Mr. Putin’s “next attempt to play with people’s lives,” without specifying whether Ukraine would also observe a truce.

The Trump administration made clear it will abandon peace attempts for Ukraine if Russia fails to adhere to any terms, but the president did not say whether there would be consequences.

During his campaign, Donald Trump said repeatedly that he would be able to end the war between Russia and Ukraine “in 24 hours” upon taking office