yes
The President
The President is the chief executive of the United States government.
The federal executive branch is headed by the President of the US.
National level, the Minister of Finance sits in the Cabinet and is appointed by the President
The president of the United States is the chief executive.
belongs to the federal level
NSS national security strategy
Federal
National defense is the job of the federal government.
National level of Government
I am assuming by level, you mean level of government. There is no distinction between government on a national level and government on a federal level. The federal level of government is the highest tier of government because its central to the nation. It represents a union of states. Those union of states form a nation. So you see how the two terms are interchangable, and can be used synonymously. The federal government is government on a NATIONAL level.
the national government