President Joe Biden’s decision to allow allies to train Ukrainian forces on how to operate F-16 fighter jets — and eventually to provide the aircraft themselves — seemed like an abrupt change in position but was in fact one that came after months of internal debate and quiet talks with allies.

Biden announced during last week’s Group of Seven summit in Hiroshima, Japan, that the U.S. would join the F-16 coalition. His green light came after President Volodymyr Zelenskyy spent months pressing the West to provide his forces with American-made jets as he tries to repel Russia’s now 15-month-old grinding invasion.

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Long shadowing the administration’s calculation were worries that such a move could escalate tensions with Russia. U.S. officials also argued that learning to fly and logistically support the advanced F-16 would be difficult and time consuming.

Read more: AP