Over the past few days, the Ukrainian military has demonstrated its ability to use western-supplied weapons wisely and effectively.
The collapse of the Russian front in the Kharkiv region is far from being a victory, but it may turn the tide of this war.
The West should reinforce the resulting momentum in favor of Ukraine by rapidly increasing its own efforts in support of it.
A clear and demonstrative increase in arms deliveries at this point in time would both bolster the Ukrainians' fighting spirit and – as has just become clear – cause the already poor morale in the Russian armed forces to fall further.
It is high time that Germany, in particular, no longer just says what is not possible, but shows determination.
A rapid expansion of support for Ukraine is also important because it is not yet clear how Moscow will react.
Over the weekend, the Russian leadership tried to pretend that nothing significant had happened at the front.
As Russian troops cleared one strategically important position after another, President Vladimir Putin opened a Ferris wheel in Moscow.
Apparently, the Kremlin doesn't know how to deal with such dramatic losses.
But Putin will have to react.
However, he faces a dilemma.
If he wants to turn the tide militarily, he must send more forces to the front.
To do so, he would have to deviate from the line with which he has so far secured his subjects' support for the war: he has kept it as far away from their everyday life as possible.
Should Putin opt for military escalation, Ukraine must be prepared for it.
If keeping the home front quiet proves more important to Putin, Ukrainians should have the means to seize this opportunity to liberate the occupied territories.