Thailand’s cabinet approved the purchase of four Gripen fighter jets as part of a broader plan to modernize its military, days after its air force used the Swedish-made jets in a deadly border clash with neighboring Cambodia.

Cambodia went back to the court in 2011, following several clashes between its army and Thai forces that killed about 20 people and displaced thousands. The court reaffirmed the ruling in Cambodia’s favor in 2013. Cambodia has again turned to the international court to resolve the border disputes but Thailand has rejected the court’s jurisdiction.

Long-simmering tensions between Thailand and Cambodia escalated to deadly violence on July 24, setting off five days of military clashes at multiple spots along the roughly 800-kilometer (500 mile) border.

Cambodia and Thailand forces fought each other for the third day over contested territory as the death toll rose to at least 32 as both sought a cease-fire.

Thailand and Cambodia clashed for a fourth day Sunday, despite both sides saying they were ready to discuss a ceasefire after a late-night intervention by US President Donald Trump.The neighbours, popular destinations for millions of foreign tourists,

Thai and Cambodian troops clashed in at least six areas along the countries’ shared 510-mile border on Thursday, killing one Thai soldier and nearly a dozen Thai civilians. The fighting—the second instance of armed confrontation between the two countries in almost two months—has sparked fears that the conflict could escalate into open warfare.

The Thai Health Ministry on Friday said more than 58,000 have fled from villages to temporary shelters in four affected border provinces, while Cambodian authorities said more than 23,000 people have evacuated from areas near the border.

Thailand has approved the purchase of four new Gripen JAS 39E/F fighters from the Swedish manufacturer Saab, aiming to bolster its air defense amid escalating tensions with Cambodia.

During five days of clashes with Cambodia that left more than 40 people dead, Thailand used its fleet of F-16s to strike military targets across the border. It was the deadliest border fighting between the two countries in decades.