However, the answer is only partial because it doesn't say if emissions increase during a war, and if so by how much.

Edit: now answered by another source.

Ukraine has started to calculate emissions linked directly and indirectly to the invasion launched by Russia on February 24, a first for a country at war. Fires in buildings, forests and fields sent into the skies 23.8 million tonnes of CO2 equivalent, and the fighting itself 8.9 million tonnes, according to the project called the Initiative on GHG Accounting of War.

The displacement of people caused 1.4 million tonnes, said the project created two months into the war, while reconstruction of destroyed infrastructure will cause another 48.7 million tonnes of carbon emissions.

The total comes to nearly 83 million tonnes as a direct consequence of the war, now in its eighth month -- compared to around 100 million tonnes produced from all sources by the Netherlands over the same period, according to the initiative.

What no-one has yet mentioned is the amount of carbon dioxide that will be released in the future as a result of replacement armaments being manufactured to replace the ones used during the conflict.

Additional environmental impacts from the war include:

• Some 30 percent of the country’s protected areas, covering 3 million acres (1.214 Mha), have been bombed, polluted, burned, or hit by military maneuvers;
• Rare steppe and island ecosystems in the south have been pummeled, threatening endemic grassland plants and insects;
• Rivers across the Donbas conflict zone in the east are being polluted by wrecked industrial facilities, sewage works, and overflowing coal mines;
• The possibility of an upsurge in uncontrolled logging of ancient forests in the Carpathian Mountains;
• The listing of 20 rare steppe species that they believe may disappear due to the war;
• Peat in the Chernobyl exclusion zone is continuing to smolder as a result of the war;
• Particularly in the Donbas region, "Many industrial plants are damaged or abandoned; wrecked sewage works gush their contents into rivers; damaged pipelines are filling wetlands with oil; and toxic military scrap is spread across the land ... No one has done any research and probably won’t for many years";
• A particular concern is the many coal mines abandoned after 2014. With pumping of water halted, they have so far released some 650,000 acre-feet (80.1763 million cubic meters) of polluted mine water into the environment;
• A few of the flooded mines are radiological hazards. For instance, Soviet scientists carried out a controlled atomic explosion at the Yunkom Mine in Donetsk in 1979. The waste remains underground. Since the pumps were turned off in 2018, the mine has overflowed into nearby underground water reserves used for drinking;
• Many also fear the long-term toxic legacy of the giant Azovstal steelworks in Mariupol, which was bombarded for many weeks before falling to the Russians in May. The works was already a notorious defiler of local soils, air, and rivers. The Russian bombardment could have released tens of thousands of tons of hydrogen sulfide into the Sea of Azov with unknown ecological consequences.