evidence: Russian lawmakers are plotting the annexation of the Sea of Azov, a shallow body of water which is shared territory between Ukraine and Russia per a two-decade-old treaty. [...] Russia and Ukraine signed and ratified a treaty in 2003 and 2004 that included stipulations that the Sea of Azov, a body of water of about 15,000 square miles, is a historically internal water of both Russia and Ukraine and that vessels flying Ukrainian or Russian flags in the Sea of Azov enjoy freedom of navigation, the ISW noted. [...] The Sea of Azov is also important for Russia's continued occupation of the annexed Crimean peninsula for logistical reasons, he said.