Qatar Petroleum (QP) signed an agreement on June 3 with Exxon Mobil Corp. (NYSE: XOM) to acquire a 30% stake in two of ExxonMobil's affiliates in Argentina, giving QP access to oil and gas shale assets in the Latin American country.

The deal would give QP, the world's biggest supplier of liquefied natural gas (LNG), a 30% share in two of ExxonMobil's local affiliates in Argentina—ExxonMobil Exploration Argentina S.R.L. and Mobil Argentina S.A., which holds rights with other partners for seven blocks, QP said in a statement.

"This is an important milestone, as it marks Qatar Petroleum’s first investment in Argentina as well as its first significant international investment in unconventional oil and gas resources," QP's Chief Executive Saad Al-Kaabi said in the statement.

The agreements were signed by Al-Kaabi, and Andrew Swiger, senior vice president at Exxon Mobil Corp., in Doha.

The announcement did not disclose the value of the investment.

The blocks, in Vaca Muerta in the onshore Neuquén basin in Argentina, are under "unconventional exploration licenses with active drilling plans as well as exploitation licenses with pilot drilling and production," QP said.

The deal between QP and Exxon comes as the world's largest publicly traded oil producer looks to rapidly expand its upstream operations under CEO Darren Woods, who inherited a portfolio with relatively few international growth operations compared to peers.

Exxon has been investing heavily in its U.S. shale operations and in Guyana, though its development in Argentina has been slow due to a host of factors, including the geographic remoteness of the country from U.S. shale operations as well as government price controls for natural gas.

By bringing in QP as a partner, Exxon cuts its financial risk and also pushes the project forward.

For QP, the deal offers a chance to invest for the first time in a sizeable shale operation while avoiding the public relations difficulties that would have likely arisen had it invested in shale operations in the U.S., where public sentiment still sees Qatar and other OPEC members as economic competitors.

It would also help Qatar guarantee long-term access to gas assets abroad, when decades from now its own gas reserves could start depleting.

For Qatar it also signals its ability to sign big multi-billion-dollar deals with oil majors despite a prolonged regional political crisis and pressure on governments and companies by other Gulf neighbors to reduce ties with Doha.

Last year, Saudi Arabia, the United Arab Emirates and Bahrain, along with Egypt imposed a political and economic boycott on Qatar, accusing it of supporting terrorism, which Doha denies.

In May, the International Petroleum Technology Conference decided to move its 2020 IPTC event which was due to be held in Doha, to Dhahran in Saudi Arabia, prompting Al-Kaabi to instruct heads of QP's subsidiaries and joint ventures to cut all ties with the organisation, according to an internal memo seen by Reuters.

The deal with Exxon appears as a show of strength by QP as the boycott continues.

“This agreement...goes hand in hand with the planned expansion of our local production from the North Field, which will further boost Qatar’s leading global position by raising its LNG production from 77 mtpa to 100 mtpa," Al-Kaabi said.

"Our oil and gas sector has not been impacted by the blockade, nor has our previously planned expansion."