Russia says the tests are creating a “nervous situation” at the Russian border.
Ukraine was due to start two days of missile tests Thursday, a move that has angered Russia, prompting it to put its air defense forces on high alert at the Crimean peninsula.
The disagreement marks a fresh escalation in tensions between the one-time allies, whose relations collapsed in 2014 after the reunification of Crimea with Russia.
Ukraine says the tests in its southern Kherson region, bordering Crimea, are legitimate and will be conducted within the framework of international obligations and treaties.
“We will continue to strengthen the defense capability of our nation and continue missile tests and training,” the secretary of Ukraine’s National Security and Defence Council, Oleksandr Turchynov, said Wednesday.