U.S. Senator John McCain leads a delegation of fellow senators to Kiev, Friday.
They visit the street where dozens were killed by sniper fire last month.
The lawmakers laid flowers at one of the many memorials to the fallen.
This comes as Crimea's pro-Russia parliament has scheduled a referendum on Sunday to decide whether the region should be annexed by Russia.
The senators later met with Ukraine's newly-installed leaders where acting president Oleksander Turchinov praises McCain's efforts.
(SOUNDBITE) (Ukrainian) UKRAINE'S ACTING PRESIDENT, OLEKSANDER TURCHINOV, SAYING:
"I am very grateful to John McCain for his participation in these historical processes in Ukraine."
McCain traveled to Kiev in December when he addressed demonstrators whose protests helped lead to the ouster of former President Viktor Yanukovich.
