The Trump administration is releasing $250 million in military aid after lawmakers raised concerns over its delay, members of the Senate Appropriations Committee announced Thursday.

The administration had put a hold on the funding, which lawmakers in both parties argued was key to fending off Russian aggression.

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"The Departments of State and Defense are proceeding with the obligation of all military and security assistance funding to Ukraine," a senior administration official said. "The Administration supports Ukraine’s efforts of reform and self-defense, and these funds will advance Ukrainian efforts toward those ends."

The decision came as members of the committee met to mark-up spending bills.

Sen. Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (Ill.), the top Democrat on the subcommittee, had offered an amendment to require that the 2020 aid allocated for Ukraine be spent on time, and threatened to put a hold on $5 billion of the Pentagon's administrative money until they did.

Durbin ultimately withdrew the amendment, though a couple Republican senators said they would have backed it as a show of support for Ukraine.

The White House last month opted not to move forward with other broader cuts to foreign aid amid pushback from some top administration officials.

A Defense Department spokesperson said earlier this month that the U.S. was working with Ukrainian officials to evaluate the needs of the country's armed forces.

But bipartisan lawmakers grew uneasy over the delay in funds and wrote to Trump earlier this month warning that the money was critical for Ukraine to develop its own military capabilities and maintain its sovereignty as it faces Russian threats.

Tensions between Russia and Ukraine have been heightened since 2014, when Moscow annexed the Crimean Peninsula and backed separatists in the neighboring country.

The move led to sanctions and Russia's expulsion from the then-Group of Eight, though President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE has in each of the past two years expressed a willingness to readmit Russia.

Niv Elis contributed.