I am going to apply to graduate programs in the US, so I contacted my professor who advised my master's thesis. He is the most important referee because I did research with him, so I think he understands me well. Moreover, he is a well-known scientist in a very prestigious university in France (top 20 of the world in my field).
At the time, I left France to my home country, he told me that he would help me further my academic career. He actually gave me two recommendation letters afterwards for 2 PhD positions. Sadly, I failed both of them.
Ten days ago, I emailed him if he could give me recommendation letters. He didn't reply for one week, so I wrote a follow-up email. However, I haven't got any responses from him until now. I am so confused because the deadline is December 15th.
Does it mean that my professor has declined my request? Should I wait for him or ask other professors?
NEWS: I just got his acceptance. He was traveling this week so he didn't got my email. Thank you all for your advices.