Grand Prince Dmitry Donskoy died in 1389 and is revered by Russian nationalists for defeating the Mongol Golden Horde at the 1380 Battle of Kulikovo. His remains were uncovered in August.
British, French, and German national security advisers also landed in Kyiv on Sunday and will reportedly take part in the second round of meetings with the US and Ukraine.
Russian President Vladimir Putin and US President Donald Trump's envoys on Ukraine held "useful" talks on Saturday.
US President Donald Trump suggested on Friday that the US had a fresh concrete proposal aimed at ending the war, which is now in its fifth year.
The Kremlin said on Friday that the possibility of a Ukraine peace settlement remained, but Russian officials are trying to change the US envoy's plans to visit Kyiv.
Since invading Ukraine in February 2022, Russia has intensified its crackdown on dissent and introduced laws prescribing long prison terms for those found guilty of "discrediting" the military.
"I have no doubt the enemy will crumble," Russian President Vladimir Putin told reporters, standing firm on his stance against Ukraine as war fatigue continues to grow in Russia.
Another 42 people were also injured and more than 380 evacuated from the strike area in the Bucha district, Tymur Tkachenko, governor of the Kyiv region, wrote on the Telegram app.
CNN reported that Ratcliffe also used the trip to warn the Kremlin to cut off economic and military support for Iran.
Kremlin spokesperson Dmitry Peskov called the reports of a Russian attack on NATO "scare-story material" and claimed that it had "nothing to do with the intentions of the Russian Federation."
SVR head Naryshkin said that he had held a "working-level meeting" with CIA director John Ratcliffe in Moscow earlier this week.
