MOSCOW — The dominant local primate here exhibits a behavior our desk has previously recorded only in hibernating mollusks: the professionally maintained closed mouth. This week the mouth has a matter before it. Ukraine's president, Volodymyr Zelensky, has signalled he would sign a ceasefire covering energy infrastructure — the stations, the substations, the wires that carry heat and light. The offer was relayed via the American president, Donald Trump. Moscow's reply has not yet arrived. Our assignment is to observe the not-arriving.

At 09:00 on Thursday, our observation began at the standard briefing position, row three, behind a man eating a sandwich with the total concentration the ceasefire has yet to receive. The spokesman opened proceedings at 09:02. At minute nine, the mouth produced its first sip of water. At minute twenty-two, its second. By close of session at 09:41, our tally read: blinks, 311; sips of water, three; clauses concerning the energy ceasefire, zero. Questions from the floor on the ceasefire: eleven. Answers received: zero. The mouth's only public statements were the sips, delivered without notes. The press corps maintains a waiting list — a queue of the queue — of questions it re-submits each morning; the senior question, No. 4, has now attended fifty-one consecutive briefings. The list has been laminated, which the corps regards as a promotion.

The silence does not alarm the locals. Marina Sokolova, a retired metro dispatcher who watches the briefings the way her former colleagues watched gauges, calls the quiet a health indicator. "When the mouth is closed, the plan is working," she said. "When they begin to explain, that is when you worry. Explaining is what they do after something has already gone wrong."

In a corridor smelling of institutional coffee, a senior fellow at the Institute for Current Situations was calmer still. "Ukraine has offered to stop striking our power stations," he said. "We are studying whether to receive this as a concession or to file it as a trap. A signature is a position. A position not taken cannot be lost. The study is going well. It has been going well for some time." He then walked, unhurried, to lunch.

Our field note: among this species, silence is a display behavior, not an absence. It tells rivals, the troop, and possibly the wires themselves that the dominant primate is unbothered. The locals treat a closed mouth the way other colonies treat a raised tail: as information.

In the field, a closed mouth ordinarily signals feeding, threat, or sleep. Our working note on this specimen: it is closed because the subject has not yet decided whether the lights are prey. We will file again tomorrow at 09:00. The mouth remains open for water only. The reply, we are told, has a place in the queue, behind the questions.