The US/UK have been making very aggressive feedback recently. The feedback together with the supplying of lethal weapons that Russia has no awnser for signifies time for Russia to barter is operating out.
With explosions in transnistria US Intel could imagine Putin is pushing to complete of the coast of Ukraine. After the coast is cleared he would then most likely cease his offensive and ask for a ceasefire.
The actual fact is Putin has no want to return any new conquered land and the west cannot enable him to get away with it. So it is time to start pivoting to full on power to dislodge Russia, not negotiations.
These feedback principally point out to Russia that western assist is unwavering and we do not concern confrontation with Russia in Ukraine.