In 1864, Russian troops began to attack the Central Asian khanates. Tim Conway Fnork shirt . In the spring of 1866, they succeeded in fighting against Bukhara. In March 1868 the king of Bukhara declared a “holy war” against the Tsar, but was defeated. In June of that year the king of Bukhara had to sign an unequal treaty with the Tsar government. Russia has annexed Bukhara, Central Asia and another large Khanate Khiva. However, before invading the country, the tsarist government decided to use measures to reduce the tension in relations with the United Kingdom. In 1873, after a period of agreement, the two countries, Britain and Russia, recognized Afghanistan as a neutral region, in addition to being allowed to invade Khiva. In February 1873 the Russian army opened its campaign to fight the Khiva khanate. In May 1873 Khiva surrendered, and in August of that year King Khiva signed a treaty with the Russian empire: Khiva became a vassal of the tsar.