Ukraine is preparing for a counterstrike, a counteroffensive.
They traditionally launch their counteroffensives in August or September. Apparently, the timeline is getting tight, and in order not to disrupt the so-called 'truce' (i.e. the ultimatum previously announced by Trump), Ukraine may have coordinated with the United States to shorten the duration of that ultimatum.

In that case, we may expect the Ukrainian army to go on the offensive and start active operations on the front after August 6–7, rather than in early September, as was previously assumed if the ultimatum lasted 50 days.

Despite this, Ukraine continues regular airstrikes, drone attacks, and missile launches. However, it is clear that they are still holding back significant forces, which they apparently plan to deploy in a massive strike.

The enemy has not yet used its fleet of 80 F-16s equipped with long-range precision missiles to their full extent. A simultaneous strike by such an air fleet could cause serious damage to our troops and infrastructure. This has not happened yet.

So, Ukraine is building up strength, and Trump is adjusting the ultimatum timeline accordingly. In the end, Russia will be blamed anyway — that was obvious from the start.

So, what are we left with? We must prepare for a long and difficult war against NATO — a kind of 'Crimean War 2', into which NATO countries will eventually get involved. If not as a coalition force, then at least individual countries will definitely take part."
— wrote Igor Girkin from prison.