Britain and France should highlight deteriorating human rights in Thailand when Prime Minister Prayut Chan-o-cha visits, and they should make clear there will be no "business as usual" until he holds a fair election, a rights group said on Monday.
Prime Minister Prayut Chan-o-cha has pushed back the date for a vote several times, while refusing to tolerate dissent.
British Prime Minister Theresa May and President Emmanuel Macron of France should "strongly express their deep concerns about the deteriorating state of human rights", Brad Adams, Asia director of Human Rights Watch, Brad Adams, said in a statement.
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"They should make clear to General Prayut that there will be no return to business as usual until Thailand holds free and fair elections, establishes a democratic civilian government, and improves respect for human rights," he said.
A general election is now due in February, but no date has been set.
Government spokesman Sansern Kaewkamnerd defended Thailand's record, saying authorities were very respectful of rights.
"Right now, Thailand respects human rights no less than any other country," Lt Gen Sansern said.
Thailand's Western allies criticised Gen Prayut's 2014 coup, which followed a decade of political turmoil that has brought two coups and bloody street protests.
The European Union put relations on hold after the coup but in December resumed political contact "at all levels".
The EU is Thailand's third-biggest trading partner after China and Japan. Thailand is the EU's third-largest trading partner in Asean.
Gen Prayut will meet Ms May in London on Wednesday, before he heads to France for a trip that includes a stop at Airbus in the city of Toulouse. He is to meet Mr Macron next Monday.
Gen Prayut and Mr Macron are due to preside over the signing of an agreement between Thai Airways International and Airbus to open an aircraft maintenance and repair hub at the civil-military U-tapao Airport, according to the Prime Minister's Office.
Thailand will also finalise the purchase of a $215-million (7-billion-baht) Theos II Earth observation satellite from Airbus, Deputy Prime Minister Somkid Jatusripitak told Reuters.
The satellite will have multiple uses, the government has said, including for agriculture and national security. Critics have concerns it might be used for surveillance and spying purposes although authorities ruled out such use.
A London-based Facebook user who faced fake news charges by the Thai police this month, KonthaiUk, also urged Thais in the UK and neighbouring countries to join a rally against Gen Prayut by a group called Thailand Human Rights Campaign UK at 10 Downing Street, Westminster, on Wednesday, during the meeting with Ms May.