Despite having found victory in mid-1919, the West Asian Pact was by no means stable. Sectarian and ethnic tensions were higher than they had ever been in the past, with sporadic skirmishes and crimes against humanity. The tipping point came in the 9th of February of 1920, when the Republic of South Armenia declared war on the Republic of Greater Kurdistan, to stop an increasingly obvious ethnic cleansing campaign. The West Asian Pact was divided on this issue, with equal amounts of support on both sides. But it was on the 13th of June of 1920, when 30,000 German troops disembarked in Alexandria to claim that part of Britain's colonial empire (which had been promised by London within the Versailles Treaty), that the West Asian War truly began. Egyptian forces were joined by the Imperial African Army in Sudan, the IAA-Somaliland and the Ethiopian Empire. A day afterwards, the Republic of Turkey declared war on the entire West Asian Pact to claim sovereignty over the half of turkey occupied by Armenia and Kurdistan. On the 21st, Emir ibn Saud of Nejd declared a holy war against the Hashemite government, which he claimed was but a British conspiracy to maintain power in the Middle East.
On the northern theatre, Ataturk's republican army could not be easily defeated. They were supported by the Soviet Union with military advisory, intelligence, weapons, ammunition and gold. However, the mountainous terrain made it extremely hard for Turkish troops to advance even with advantages in morale, firepower and leadership. By mid-1922 the borders of modern-day Turkey had been reached, a stalemate emerged, and Ataturk's government made no attempts to push any further. The Republic of South Armenia was annexed in its entirety, while the Republic of Greater Kurdistan saw its territory reduced by over half.
The Saudis under ibn Saud proved formidable desert fighters, perhaps more so than Hussein's. They were supported by the German Empire with officers, small arms, munitions and cash in a sort of Arab counter-revolution. With the Regular Arab Army tied up in the north, and its remaining allies fending off a German invasion, Arabia could not be held. Furthermore, despite its historical and religious significance, most of the Pact's population and industry was in Syria, Iraq and especially Egypt, which were deemed more important against Hussein's wishes. Ibn Saud's rebellion would be successful, giving birth to a Wahhabi-Absolutist Saudi Arabia.
But of all forces the West Asian Pact faced, unsurprisingly it was the Germans who proved the most formidable. From its initial three divisions, Germany's expeditionary army had grown to six by the end of the year. To make matters worse, the Kingdom of Italy also landed eight divisions in Libya, swiftly retaking its former colony, and moving half of its force to reinforce Central Powers forces in Egypt. In response the Regular Arab Army raised over 180,000 men, largely led by British and French deserter-officers, exclusively to fight in Egypt. IAA-Sudan, IAA-Somaliland and Ethiopian soldiers numbered around 100,000. However, these forces were less capable than the veteran Arab troops, which had received enormous amounts of Entente equipment and many of its officers. Despite outnumbering the Central Powers almost 3-to-1, German tactical superiority and their endless aeronaval support made it a difficult fight. In 1921, they had almost reached Cairo. It was only by the bravery of the Palestinian Tank Regiment's charge into a weak sector of the German line, and the subsequent lightning-fast horseback raids into the German rear, that really turned the tide. About half of Germany's artillery, a good portion of its aircraft and many of its command posts were seized and/or destroyed by Arab cavalrymen or their Bedouin allies. To avoid destruction, Central Power forces retreated to the modern-day Libyan border, where gruesome trench warfare ensued, with constant naval bombardment on the German side and desert raids on the Arab one. In July of 1924, as the situation in the Balkans became a higher priority for Germany, a ceasefire was agreed upon. On August 17th, 1924, both sides signed the Treaty of Alexandria, by which peace was achieved.
Throughout the war, West Asian Pact and Imperial African Army forces received aid from the United States of America and the Japanese Empire in the form of weapons, munitions and gold. Many former servicemen in Britain and France were also convinced of the third world's struggle against German aggression and their (perceived) undying loyalty, travelling to join their conflicts.