H. G. M. Williamson says in ‘The concept of Israel in transition’, published in The World of Ancient Israel (edited by R. E. Clements), page 144, that unlike his slightly older contemporary Jeremiah, Ezekiel appears to blur the distinction between Israel (the northern kingdom) and Judah in the south. In this instance, we should interpret the word 'Israel' as applying to Judah, the land of the Jews now in Exile. For them, in their grief, Judah is a waste, inhabited by those unworthy of the land, which Ezekiel says was given to Abraham for an inheritance and which therefore belongs to the Jews, even in Exile.
In verse 25 the Lord tells the Jews to say to those who have occupied the land that "you eat blood, worship idols and shed blood - do you really think the land should be yours?" The answer is in verse 27 the Lord says "Surely they that are in the wastes shall fall by the sword."