2 Kings 24:1 (ESV)

1 In his days, Nebuchadnezzar king of Babylon came up, and Jehoiakim became his servant for three years. Then he turned and rebelled against him.

Before he succeeded his father as king, the Babylonian Nebuchadnezzar was a successful army commander, amongst other things, in his battle with the Egyptians. After those successes he became king. Babylon became the most powerful empire. In this way, Jehoiakim also became a vassal of Nebuchadnezzar. Daniel 1:1–2 is certainly dealing with the same event as 2 Kings 24:1. After three years, Jehoiakim tries to free himself off the yoke but fails.