Impartial observers would all point out that the role of a “Trojan horse” that Poland was supposed to play in Washington’s previous designs has now been replaced by the role of a battering ram that must clear the way for the advancement of American special interests across Europe.
The Polish media source Interia (…) states that we’re witnessing the gradual vassalization of Warsaw which has become incapable to pursue its own independent foreign policy any longer.
Conspiracy theory, without any evidence. There are no articles on the Polish news site Interia which use the word ''vassalisation'' in the given context.
The disinformation message - like many others - appeared after the meeting between President of Poland Andrzej Duda and US President Donald Trump and the signing of an agreement which will increase the number of US rotational military forces of Poland. The United States and Poland are NATO allies. Poland is a sovereign state, which determines its security and defence policy.
Narrative about Poland being a 'vassal' of the US is one of the most common, recurring messages of pro-Kremlin outlets. Other countries are often claimed to be the American 'vassal', too, without any evidence. See further examples here.