US President Joe Biden will ask Congress for more than $770 billion to fund defense programs in the next fiscal year, according to Reuters.

The amount, which is $17 billion or more more than what Biden asked lawmakers last year, was the result of the Pentagon's push to modernize the military, three sources said.

The final amount is subject to change as budget talks for fiscal year 2023, which begins October 1, continue between Secretary of Defense Lloyd Austin and the White House Office of Management and Budget (OMB), they said.

The national defense budget includes funding for the Department of Defense, which covers everything from tanks to the salaries of troops, as well as nuclear weapons programs under the Department of Energy and defense-related programs elsewhere.

The defense budget for fiscal year 2023 will focus on shipbuilding, new space capabilities, better missile attack warning systems and upgrading nuclear submarines, bombers and missiles, one of the sources said.

Another source said the Pentagon will continue to invest in research and development of military capabilities that could match those of China and Russia in any potential conflict in the future.

The Pentagon also hopes to save money by decommissioning older and less-used weapons systems, including the A-10 Warthog, which was used primarily in Afghanistan.

Last year, Biden asked lawmakers for almost $753 billion for the fiscal year 2022 national defense budget, which was eventually raised to $768.2 billion.