Seen from above, bow to the right, at one scale: length by beam. Each new class is longer, and Project 10510 is 40% wider than anything before it.
Lengths, beams and displacements from Wikipedia: Lenin (1957 icebreaker), Arktika-class icebreaker, Taymyr (1987 icebreaker), Project 22220 icebreaker, Project 10510 icebreaker, Sevmorput, Titanic. Hull outlines are simplified; only the length and beam are measured.