《元史·列传·卷四十四》
而我国内空虚，塔察国王与李行省相互勾结，威胁后方；西域诸胡窥伺关陇，旭烈大王正远征在西方，与中国本土隔绝；企图夺取皇位者，大有人在。
第吾国内空虚，塔察国王与李行省肱髀相依，在于背胁；西域诸胡窥觇关陇，隔绝旭烈大王；病民诸奸各持两端，观望所立，莫不觊觎神器，染指垂涎。
However, our mainland is empty, and King Tachai and Li Hangsheng are conspiring together, which threatens our rear. The non-Han people in the Western Regions spy on Guanzhong, and King Xulie of A-shu is on a campaign to the west, far from mainland China. There are many people who want to seize the throne.
<s>[INST] Kindly elucidate the central themes in this passage in English: 第吾国内空虚，塔察国王与李行省肱髀相依，在于背胁；西域诸胡窥觇关陇，隔绝旭烈大王；病民诸奸各持两端，观望所立，莫不觊觎神器，染指垂涎。 [/INST] However, our mainland is empty, and King Tachai and Li Hangsheng are conspiring together, which threatens our rear. The non-Han people in the Western Regions spy on Guanzhong, and King Xulie of A-shu is on a campaign to the west, far from mainland China. There are many people who want to seize the throne.</s>
Kindly elucidate the central themes in this passage in English: 第吾国内空虚，塔察国王与李行省肱髀相依，在于背胁；西域诸胡窥觇关陇，隔绝旭烈大王；病民诸奸各持两端，观望所立，莫不觊觎神器，染指垂涎。
user
However, our mainland is empty, and King Tachai and Li Hangsheng are conspiring together, which threatens our rear. The non-Han people in the Western Regions spy on Guanzhong, and King Xulie of A-shu is on a campaign to the west, far from mainland China. There are many people who want to seize the throne.
assistant