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RPT-UPDATE 2-On Ukraine visit, Blinken, Austin pledge return of U.S. diplomats, more security aid

(Repeats with updated editing credit; no changes to story text)

By Simon Lewis

SOUTHEASTERN POLAND, April 25 (Reuters) - Washington's top diplomat and its defense chief used the first official U.S. visit to Ukraine since Russia invaded in February to announce a gradual return of U.S. diplomats including a new ambassador and over $300 million in new military aid to Kyiv.

Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin traveled to Poland on Saturday in a previously undisclosed trip, and took a train the following day into Ukraine where they met President Volodomyr Zelenskiy and other top Ukrainian officials.

"In terms of Russia’s war aims, Russia has already failed and Ukraine has already succeeded," Blinken told a briefing in Poland after the two officials returned from the meeting.

The visit was designed to show Western support for Ukraine and the cabinet secretaries also pledged new aid worth $713 million for Zelenskiy's government and countries in the region, where Russia's invasion has raised fears of wider aggression by Moscow.

It also highlighted the shift in the conflict since Ukrainian forces, armed with a massive influx of weapons from the West, successfully repelled a Russian assault on Kyiv.

"Our focus in the meeting was to talk about those things that would enable us to win the current fight and also build for tomorrow," Austin told the briefing, calling the meeting in Kyiv "very productive."

Blinken and Austin told Zelenskiy of more than $322 million in new foreign military financing for Ukraine, taking total U.S. security assistance since the invasion began to about $3.7 billion, a senior State Department official said.

"It will provide support for capabilities Ukraine needs, especially the fight in the Donbas," the official said, referring to the southeastern region where Russian forces have regrouped and are trying to capture.

He said it would also help Ukraine's armed forces transition to more advanced weapons and air defense systems, essentially NATO-capable systems.

Following their Kyiv visit, the White House announced on Monday that President Joe Biden was nominating veteran diplomat Bridget Brink as the new U.S. ambassador to Ukraine, acting to fill a crucial position that was vacant for nearly three years.

Brink, now serving as U.S. ambassador to Slovakia, has been a career diplomat for 25 years and worked in Uzbekistan and Georgia as well as at several senior positions across the State Department and White House National Security Council.