Defense ministers from NATO member countries are meeting this week to discuss the rising tensions in Eastern Ukraine, where fighting between Ukrainian forces and Russian-backed separatists has indicated the start of a Russian offensive.

According to a report from Newsweek, NATO allies would run out of ammunition within days of a war with Russia, as the Ukraine military’s needs have outstripped production rate. This has caused a drain on NATO stockpiles, which have been unable to keep up with the demand.

Meanwhile, a letter published in The Telegraph asked whether NATO has a viable strategy for preventing a stalemate in Ukraine. With tensions continuing to rise, the question of whether Europe can intervene for peace has been raised.

The NATO defense ministers are expected to address these issues during their meeting this week.