Three agreements and memoranda of understanding were signed on the sidelines of the visit of the Crown Prince. The crown prince denies involvement, yet the Central Intelligence Agency has reportedly concluded that he ordered the assassination.
Mr Corbyn told the Commons: "The Prime Minister told the media she would sit down and be robust with Crown Prince Mohammed bin Salman, the chief architect of the brutal war in Yemen which has killed 56,000 people and brought 14 million to the brink of starvation".
Corbyn said the exception was the "mandate for change" won by the new Mexican president, Andrés Manuel López Obrador, whose inauguration he attended this weekend. The announcement was made in the presence of the Crown Prince and the Mauritanian president.
Ms. May's conservative government had come under mounting pressure after revelations that British arms sales to Riyadh had increased by two-thirds, or more than $570 million in 2017, even as Riyadh was receiving harsh criticism for the war it is spearheading in neighboring Yemen against Iranian-backed Houthi rebels.
The trip marked the highest-profile overseas junket for the crown prince since Khashoggi's murder.
Israeli PM Netanyahu's legal troubles mount as police seek new bribery charges
Other opposition figures, including opposition leader Tzipi Livni, quickly joined in the call for Netanyahu to resign. They recommended Sara Netanyahu face charges of bribery, fraud, breach of trust and obstruction of evidence.
Latin American countries Like Argentina in particular do not want to risk potential investments from the oil-rich kingdom, he added.
In the statement, they said the "whole world is certain that he ordered a bad crime against the journalist Jamal Khashoggi".
"Rather than be robust, as she promised, we learned the Prime Minister told the dictator "please don't use the weapons we are selling you in the war you're waging" and asked him nicely to investigate the murder he allegedly ordered".
The five projects, due to be launched in 2019, were agreed upon at the 12th Algerian-Saudi Business Forum held in the capital Algiers earlier in the day.
"They're not precisely champions of human rights or freedom values, he said".