Within a single 24-hour window, two of NATO’s eastern flank countries learned that the political ground beneath them had moved. In Riga, Prime Minister Evika Siliņa resigned Thursday after her coalition partner withdrew support over the government’s handling of Ukrainian drones that crashed into Latvian territory. In Warsaw, officials were told by cable Wednesday evening that the 4,000 U.S. soldiers they had been expecting from Fort Hood would not be coming. The decisions were taken in different capitals for different reasons, but they arrive at the same place: the alliance’s Baltic frontier is short on air defence and shorter on certainty about what the United States will and will not do to backstop it.
Riga: the politics of an undefended sky
The proximate trigger in Latvia was a May 7 incident in which two suspected Ukrainian drones entered Latvian airspace and one crashed at a fuel storage facility. Latvian officials have attributed the diversion to Russian electronic warfare, and Ukraine’s foreign minister, Andrii Sybiha, said as much publicly. The political damage was domestic. Defence Minister Andris Spruds, of the Progressives Party, resigned over the incident. Siliņa, of the centre-right New Unity party, replaced him with Colonel Raivis Melnis, a non-party military professional. The Progressives read the choice as a snub, pulled out of the coalition, and Siliņa lost her majority. She announced her resignation Thursday in a televised statement: “I am resigning, but I am not giving up.” General elections were already scheduled for October.
The collapse is more than a coalition dispute. It is a referendum on whether a small NATO member can credibly police its own airspace at the cost of drones that, by Latvian and Ukrainian accounting, are not aimed at Latvia at all. The country has a population of under two million and a defence budget that, even at NATO’s elevated targets, cannot purchase a layered air-defence system on a timeline that matches the threat. The political class in Riga knows this. Voters, asked to absorb the same arithmetic, decided someone had to answer for it.
Washington: a deployment cancelled, an explanation declined
The Pentagon’s decision arrived without ceremony. The 1st Cavalry Division’s 2nd Armored Brigade Combat Team had already held a “casing the colours” ceremony at Fort Hood, Texas on May 1; equipment was in transit. The Polish government was notified Wednesday evening, May 13, that the rotation was cancelled. Asked for an explanation, Defense Department spokesman Sean Parnell said the department had “no comment on this at this time.” Army Secretary Dan Driscoll and Vice Chief of Staff Gen. Christopher LaNeve, testifying before the Senate Armed Services Committee on May 12, did not mention the cancellation. Senator Jack Reed flagged an Army budget shortfall during the hearing; subsequent reporting put the figure between $4 billion and $6 billion.
The cancellation follows Secretary of Defense Pete Hegseth’s May 1 order to withdraw roughly 5,000 U.S. troops from Germany over the next six to twelve months. Chief Pentagon Spokesman Sean Parnell, announcing the withdrawal, said the decision “follows a thorough review of the Department’s force posture in Europe and is in recognition of theater requirements and conditions on the ground.” Taken together, the moves bring U.S. troop levels in Europe close to their pre-February 2022 baseline, the posture that existed before Russia’s full-scale invasion of Ukraine.
When you look at the US presence in Europe, it is still vast and massive. — NATO Secretary General Mark Rutte, B9 summit, Bucharest, May 13
Warsaw: the diplomatic shrug, and the calculation behind it
Polish officials reacted in two registers. Polish President Karol Nawrocki, in a statement quoted by Euronews, framed the cancellation as a manageable adjustment: “If President Trump decides to relocate American troops from Germany, Poland is ready.” Deputy Prime Minister Władysław Kosiniak-Kamysz used a post on X to suggest the change was a continuation of previously announced repositioning rather than a rupture. A senior NATO military official, speaking to Euronews on customary background terms, said rotational forces “do not factor into NATO’s deterrence and defence plans,” a technically accurate point that elides the political weight a rotation carries on the eastern flank.
The calculation underneath the calm: Warsaw has spent two years building the largest army in Europe, hosts the V Corps forward command at Camp Kościuszko, and runs Aegis Ashore at Redzikowo. Polish officials have, for some time, been preparing for a scenario in which they cannot count on the U.S. brigade rotation as a guaranteed feature of their defence posture. The cancellation tests, rather than refutes, that planning.
What the U.S. reader should take from this
The U.S. consequence is concrete. A combat brigade based in Texas will not deploy to a NATO ally on Russia’s border this rotation. A NATO government has fallen over an air-defence gap that the alliance has not closed and that the United States has, until this week, helped to close through force posture. NATO Secretary General Mark Rutte, at the B9 summit in Bucharest on May 13, made the structural point in budgetary terms: “We cannot continue taking out $20,000 costing drones with 3 or 4 million costing missiles.” The alliance is short on cheap interceptors and on layered radar coverage in the Baltic states. Closing that gap requires either sustained U.S. force presence or a European capability surge, and the political space for the first is narrowing faster than the second is materializing.
For American readers, the question is not whether the U.S. abandons Europe (by Rutte’s own accounting, the U.S. footprint remains substantial) but whether Washington still treats rotation predictability as a foreign-policy instrument. The signal sent Wednesday evening, by cable, with no on-the-record explanation, is that the answer is changing. Riga’s political crisis is one consequence of the answer. There will be others.