The Russian bridge is on illegally occupied Ukrainian territory and it crosses a formally recognized international waterway. The Ukrainians have a right to pass that strait and so does anyone else who wants to pass there. The Russian bridge did not change that status as an international waterway...just the same as China’s artificial islands do not change the facts of the South China Sea.
Big difference from how you frame this issue.
Who decides that in your opinion, the people of Crimea, or the foreign backers of the Kiev Putsch?