Some NATO countries worry using any version of the term “Article 5” for Ukraine defense could weaken its deterrence.

Welcome to The Hill’s Defense & NatSec newsletter beacon Defense &National Security The Big Story US, Ukraine disagree on whether Russia following ceasefire President Trump defended Russian President Vladimir Putin as holding to the terms of his personal request to halt attacks on Ukraine for seven days.

President Volodymyr Zelenskyy said Sunday that a U.S. security guarantees document for Ukraine is “100% ready” after two days of talks involving representatives from Ukraine, the U.S. and Russia.

U.S. and European officials are growing increasingly worried as hundreds of millions of dollars in U.S. energy assistance previously

Ukrainian President Volodymyr Zelenskiy listens to U.S. President Donald Trump, after Trump said that Russian President Vladimir Putin expressed willingness t