Current debates in the United States regarding NATO and aid for Ukraine reflect deeper shifts in approaches to global security. This was stated by Steven Pifer, an affiliate at the Center for International Security and Cooperation within the Freeman Spogli Institute at Stanford University and former US Ambassador to Ukraine (1998–2000), at the 18th annual Kyiv Security Forum “Darkness or Dawn: Is Light Ahead?”
According to Pifer, for decades the United States carried the primary burden for European security, while many European countries underinvested in defence. However, the situation has begun to change. “Last summer, we saw significant shifts – European countries began increasing their defence spending to 3.5% of GDP,” he noted.
Pifer emphasised that rhetoric regarding the reduction of the country's international role intensified in the US, including ideas of withdrawing from NATO.
“And that would be a mistake. A less stable Europe is not in the interests of the United States,’ the expert said.
He emphasised that any weakening of transatlantic unity could also affect the global standoff with China, as the support of allies remains critical.
Pifer pointed out that since the beginning of 2025, the US has not virtually provided new military assistance to Ukraine, despite continued public support.
“This refers either to previously funded aid or to weaponry purchased by Europeans. Over 60% of US citizens are in favour of continuing support, and this position also prevails in the Senate,” he noted.
In his view, the US military presence in Europe is a key factor in deterring russia. “Roughly 100,000 American troops in Europe send a clear signal that halts further russian expansion.”
He emphasised that strengthening Ukraine is the most effective strategy.
“It is essential to provide Ukraine with sufficient resources to stop Putin and constrain his further ambitions. Deterring russia comes at a cost, but failing to do so will cost far more,” the expert concluded.
“Open Ukraine” is an international foundation established in 2007 on the initiative of Arseniy Yatsenyuk to strengthen Ukraine’s international standing. Each year, it organises the Kyiv Security Forum – Ukraine’s leading international platform for discussing war and peace – as well as the Youth Kyiv Security Forum, aimed at fostering a new generation of Ukrainian leaders.


