How did the marshall plan promote the truman doctrine in western europe after world war ii

They both kinda went hand and hand. Since even though the US offered money to the EEC, the soviets believed that the money was an act of submission of influence and power to the US, so they denied the money even though the money was offered to all nations of Europe that suffered by ww2.

Nations that were distressed by ww2 or any war after ww2 is vulnerable for the communist expansion.

Question does not make that much sense since the Truman Doc targeted states more in the middle east, asia, and africa. Europe was mostly "stable"  post ww2. and the truman doc was mostly assassinate for war torn dis-table nations.