This pause was predictable (I predicted it in Nov 2024). It's negotiation leverage to steer toward an immediate resolution of the war.
An immediate resolution of the war cuts losses: Ukraine loses territory, but keeps its sovereignty.
The challenge is that there aren't many other viable paths. An indefinite forever war, with high risk of a Ukraine state collapse, is a most likely alternative. A direct confrontation between NATO and Russia is another, much less likely alternative. The idea that Russia's economy will collapse is highly unlikely.
The Trump Administration will resume military aid after Ukraine is forced to ceasefire talks. Ukraine will not likely (nor with EU) recognize loss territory. However Russia is likely to hold it de facto.
Although I doubt any peace negotiated will last decades. The reasons for the war are deep.