Russia's current Vladimir Putin has served the country for 20 years as a leader. But the most controversial amendment in Russia would allow Putin to cling on to his presidency almost indefinitely.
What many critics are calling a “constitutional coup” will enable him to stay in power at least until 2036, which would make him Russia’s longest-serving leader. Stalin currently holds the record with a 29-year term.
Here is a list leaders who have ruled or are ruling for the longest period: