The sword is the truth from the mouth of Jesus.
Check who Jeremiah is talking about.
Bible prophecy from Jeremiah 25:11-12
www.aboutbibleprophecy.com/jeremiah_25_11.htm
In Jeremiah 25:11-12, the prophet said that the Jews would suffer 70 years of Babylonian domination. Jeremiah also said Babylon would be punished after the 70 years. Both parts of this prophecy were fulfilled. In 609 BC, which is about 2600 years ago, Babylon captured the last Assyrian king and ruled over a vast part of what had been the Assyrian empire, to which the land of Israel previously had been subjugated.
No, the sword is a curse under the appearance of a harmless cup of wine.
"When they have drunk it they will vomit and go mad; Such is the sword that I am sending among them."
Read Jeremiah 25:15 to the end of the chapter. The sword will begin in Jerusalem and continue to the ends of the earth, just like Jesus commissioned his disciples to do.