As an AI language model, I don't have real-time access to news articles or social media posts. However, I can provide a general response based on the information available up until September 2021.

 It's important to note that Donald Trump's social media posts can be unpredictable and often generate significant attention. While I cannot comment on any specific instance where Trump mused about fleeing to Russia on his new social media platform, Truth Social, it is worth mentioning that Trump has expressed admiration for Russian President Vladimir Putin in the past.

 During his presidency, Trump faced several controversies related to Russia, including allegations of interference in the 2016 U.S. presidential election and potential collusion between his campaign and Russian officials. While these allegations were investigated, no conclusive evidence of direct collusion was found.

 Trump's relationship with Russia has been a subject of public scrutiny, and his comments about Russia have occasionally raised eyebrows. For instance, during a 2016 press conference, Trump publicly encouraged Russia to find and release Hillary Clinton's missing emails. This statement drew criticism from many who perceived it as a call for foreign interference in American politics.

 Additionally, Trump's admiration for Putin has been evident in his public remarks. He has praised Putin's leadership style and expressed a desire for better relations between the U.S. and Russia. However, it's essential to note that expressing admiration for a foreign leader does not necessarily imply a desire to flee to their country.

 In conclusion, without specific details about the content of Trump's post or any references, it is challenging to provide a detailed answer. However, it is important to approach social media posts with critical thinking and consider the context and potential motivations behind them.