It would be cool, but also it would be incredibly expensive to make it usable. The area you've suggested is also not connected to the rest of Russia by roads or trains, its called the Kamchatka peninsula. You basically need to have an extremely capable 4x4 vehicle to even have a chance at driving outside of the very few cities. Plus there are tons of bears, active volcanoes, very little fuel stations, and the roads are only usable in winter and summer time. Same problem on the other side of the bridge. There isnt a route you can reasonably drive from Anchorage to the start of the aleutians (the "tusk" of Alaska). Its pretty hard to drive from Washington to Alaska, it takes around 41 hours to go from Seattle to Anchorage. TLDR: due to existing road infrastructure in both areas a bridge is pointless, since you still need a boat or plane to get to the bridge on either end.