(Reuters) - Estonia on Friday summoned the Russian ambassador to condemn President Vladimir Putin's "completely unacceptable" praise for an 18th century Russian ruler who captured a city that is now Estonian.

Putin paid tribute on Thursday to Tsar Peter the Great, who he said had taken back territory that was Russia's during a long war with Sweden from 1700 to 1721. Putin specifically mentioned Narva, which belongs to Estonia, one of the three Baltic States and a NATO member.