Story highlights President Barack Obama's administration said Tuesday it was seeking to expand U.S. military spending in Europe four-fold

It's part of a bid to reassure allies still unsettled by Russia's incursion into Ukraine

Washington (CNN) President Barack Obama's administration said Tuesday it was seeking to expand U.S. military spending in Europe four-fold in a bid to reassure allies still unsettled by Russia's incursion into Ukraine.

The new spending would increase to $3.4 billion under the new plan, which is set to be formally unveiled next week as part of Obama's final presidential budget.

The Pentagon also said Tuesday it was ramping up spending for the battle against ISIS, doubling last year's request to $7 billion.

The White House said that figure would allow for "continuous U.S. armored brigade rotations" through stations in central and eastern Europe, as well as ramped-up U.S. participation in NATO military exercises and the deployment of additional combat vehicles and supplies to the region.

Obama has sought to affirm the U.S. commitment to NATO ever since Russia annexed sections of Ukraine in 2014, causing alarm in other neighboring countries, some of which belong to the military alliance.

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