The Kremlin warned that tank deliveries would be a dangerous escalation of the conflict in Ukraine.

Germany is one of the main donors of weapons to Ukraine, and it ordered a review of its Leopard 2 stocks in preparation for a possible green light.

The Kremlin is hungry for good news from the battlefield after months of setbacks.

The Bradley brings more firepower but carries fewer troops. The more lightly armored Stryker, because it is wheeled, can move a lot faster on paved roads, meaning it can get infantry squadrons into the fight faster.

There was no immediate word on whether the morning crash, near a kindergarten and reportedly in heavy fog, was an accident or related to the war.

Meanwhile, the top U.S. military officer travels to the Ukraine-Poland border to meet with his Ukrainian counterpart for the first time.

The meeting comes as the international community ramps up the military assistance to Ukraine, including expanded training of Ukrainian troops by the U.S.