Ukraine has begun surface-to-air missile tests over the Black Sea, west of the disputed Crimea peninsula. Russia, which annexed Crimea in 2014, had called the planned tests a provocation and threatened to shoot the missiles down. <br/><br/>But today Russia's air transport agency said, Ukraine had moved the border of the test area further away, apparently reducing Russian concerns. A Ukrainian official said, the tests are in line with international law.<br/><br/>Earlier this week, Ukraine issued a warning defining an area in the north of the Black Sea that aircraft should avoid today and tomorrow.