The leader of the UUP has announced the party will run candidates in 16 constituencies across the north.
Steve Aiken had previously suggested the party would run in all 18 constituencies.
He later rowed back from that position following pressure in North Belfast and from unionist rivals over standing a candidate against DUP deputy leader Nigel Dodds, who is expected to face a tight race against Sinn Féin's John Finucane.
The other constituency which the UUP will not run in is West Belfast, a seat which has traditionally been dominated by Sinn Féin with only a small unionist vote.
Mr Aiken also came under pressure for his party to stand aside in South Belfast where the DUP's Emma Little Pengelly is expected to come under pressure from SDLP candidate Claire Hanna.
Sinn Féin and the Green Party have stepped aside in South Belfast for Ms Hanna as a remain candidate in the Brexit debate.
Mr Aiken described next month's poll as the "most important election in generations" and said he wants to offer pro-union voters a choice.
"The future direction of the United Kingdom and Northern Ireland's place within it is at stake," he said.
"Three years on from the EU referendum we are offered a deal that puts a border up the Irish Sea and weakens the United Kingdom.
"The Ulster Unionist Party is clear, if we are being asked to leave the European Union with the current disastrous deal then we are better to remain and protect our United Kingdom.
"We want to offer pro-Union voters a choice. A choice between Ulster Unionist candidates who will offer a positive, progressive vision for unionism, protecting our place within the United Kingdom and the DUP who have dropped the ball, allowing a border to be put up the Irish Sea and dragged the reputation of unionism into the gutter.
"I am proud to offer a slate of candidates who will stand up for positive, progressive, pro-Union values and ensure Northern Ireland is a modern, vibrant part of a modern, vibrant United Kingdom."
UUP election candidates
East Antrim: Steve Aiken
North Antrim: Robin Swann
South Antrim: Danny Kinahan
East Belfast: Carl McClean
South Belfast: Michael Henderson
East Derry: Richard Holmes
Fermanagh South Tyrone: Tom Elliott
West Tyrone: Andy McKane
Foyle: Darren Guy
Lagan Valley: Robbie Butler
Mid Ulster: Neil Richardson
Newry & Armagh: Sam Nicholson
North Down: Alan Chambers
South Down: Jill Macauley
Strangford: Philip Smith
Upper Bann: Doug Beattie
