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

By Tom Balmforth KYIV, Feb 5 (Reuters) - Starlink internet terminals used by Russian troops in Ukraine have been deactivated, Kyiv said on Thursday, dealing what one official said was a big battlefield setback for Moscow that had disrupted assault operations.

Seizing on the frigid weather, Russia has launched an all-out assault on Ukraine’s energy infrastructure, with the apparent aim of keeping up pressure amid ongoing peace negotiations—and sapping public morale.

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.

Officials from Ukraine, the United States and European nations have quietly been discussing a new plan under which Western forces — including US troops — could be sent to Ukraine if Russia repeatedly violates a ceasefire agreement that might be negotiated to end the war.