Trump held a peace summit in Alaska with Russian President Vladimir Putin on August 15, and on an August 18 a White House summit with Ukrainian President Volodymyr Zelensky and key European leaders.
US Treasury Secretary Scott Bessent said that the administration was ready to attempt to "collapse" Russia's economy with help from the European Union.
US President Donald Trump said this week he was "very disappointed" in Putin and his moves to grow closer to China's Xi Jinping.
Putin said he is open to meeting Zelensky in Moscow, while Ukraine denounced the offer as unacceptable.
Staff guided parents and children into protected areas under rehearsed protocols, then resumed events once the all-clear sounded amid renewed Russian strikes nationwide.
Officials gave no immediate indication whether the murder had any direct link to Russia's war in Ukraine.
The US told the UNSC that recent deadly missile and drone attacks "cast doubt on the seriousness of Russia’s desire for peace."
"He was not happy about this news, but he was also not surprised. These are two countries that have been at war for a very long time," Leavitt said of Trump.
Russia, which denies targeting civilians, has stepped up air strikes in recent months on Ukrainian towns and cities far from the front lines of the war.
"It's very, very serious what I have in mind, if I have to do it, but I want to see it end," Trump told reporters at the White House, adding that he did not want to enter a world war.
Russia and Ukraine exchanged 146 prisoners of war from each side on Sunday
