Keanu visited The Hermitage Museum in St. Petersburg Square today.
Many thanks to misha_lu_for sharing a short video clip n instagram. You can see Keanu in the background.
Update: Many thanks to Sofia Kolotovkina for sharing two photos of Keanu at The Hermitage Museum today on VK. She has since hidden her page. Thanks to Ayako for the link and grabbing the photos. You can see them here.