What does Jeremiah 34:6 mean?

Jeremiah gave this message to Zedekiah while the Babylonian army was attacking Jerusalem and the last two cities of Judah—Lachish and Azekah—since those were the only ones left holding out. Jeremiah 34:6 - Modern Text Bible

(Jeremiah delivers God's message while the Babylonians are closing in, and only a couple of cities are still resisting.)