Dominican Republic seals border with Haiti, escalating tensions over canal project

Dominican Republic closing all land, air, and sea borders with Haiti over dispute about a canal being built on the Haitian side targeting waters from a shared river.
Closure will have economic impact, especially on Haiti which relies heavily on trade with Dominican Republic.
Dominican Republic argues canal violates treaty and affects their farmers and environment.
Haiti asserts sovereign right to use natural resources, but its government has not addressed Dominican concerns over the canal.
Border closure seen by some as political move by Dominican president facing re-election.