This month’s summits between America, Russia and Europe haves produced no concrete agreements on ending Ukraine’s war. On land, Ukrainian forces are limiting Russian advances on the eastern front to a slow, bloody crawl. At sea too, it is up to Ukraine’s drones, missiles and small boats to keep the Russians out.

As Ukraine pushes a shock incursion into Russia, a drone unit tasked with supporting the mission tells CBS News why the inexpensive weapons are so vital.

The Ukrainian army has attacked the Russian army with its new weapon, the Palianytsia drone missile, for the first time. Speaking during Independence Day celebrations, Volodymyr Zelensky said that the Palianytsia represents a “completely new class” of weaponry.

Russia’s Foreign Minister said on Sunday there were no plans for a meeting between Ukrainian President Volodymyr Zelensky and Russian President Vladimir Putin, dealing a setback to President Donald Trump’s peace efforts.