Volcanic activity worldwide 26 Oct 2021: Fuego volcano, Karymsky, Krakatau, Reventador, La Palma, Le...

La Palma (Canary Islands (Spain)): Compared to yesterday, the visible activity at the vents has decreased somewhat today. Only one of the vents seems now to produce pulsating lava fountains and an ash plume has been rising to approx. 2-2.5 kilometers today. Surface lava flow activity near the vents has decreased a lot as well.
Last evening, following hours of intense activity from at least four vents, parts of the western crater walls at the vents collapsed and gave way to short-lived floods of lava on the slopes of the cone. Whether or not the visible decrease is caused by a decrease of magma supply at the moment, remains unknown.

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One factor to consider is that such larger re-configurations at the vent create new conditions so that the arriving magma might more easily find new ways to enter existing or create new tubes, and remain hidden from direct view.
However, it is likely that currently, indeed less magma is reaching the surface, but is this a sign the eruption might be waning? Likely not, unfortunately: instead of slowly deflating (as the magma chamber is being emptied by the eruption), the ground near the eruption site has been rising significantly again. And quite dramatically so. If the station LP3 has a correct measurement, the ground rose 10 cm (!) since yesterday. If that amount of inflation is caused by more magma arriving from depth into shallower reservoirs than what is erupting, it would fit the picture of less activity at the vents.

...25 Oct:
The eruption continues with little changes, and remains very intense. The active cone shows strong explosive and effusive activity; in particular, the summit vents have been producing spectacular lava fountains and generate an ash plume that rose to 3,800 m this morning. Several surface lava flows have been observed flowing from the cone.
The mixed explosive-effusive activity paired with high rates of magma reaching the surface causes frequent small and sometimes larger changes of the geometric configuration at the growing cone, as rapid accumulation works against the forces of gravity, drag of material ejected and flowing away and parts that become undermined by formation of tubes etc.; currently, at least 4 or 5 vents are active aligned in a row, with different behavior as the magma pressure varies with the height of the vents themselves and the complex interactions of the rising gasses and the fluid magma in the conduits.
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To get an impression, watch the activity at the vents filmed by drone from the government today:

#ErupciónLaPalma Imágenes en las que se observan las coladas de desborde del conelete así como su velocidad de descenso desde el cono principal, tomadas hoy por los drones del @IGME1849 y #GES de @AdmPcasGobcan pic.twitter.com/wNBfNgTVAv

— 1-1-2 Canarias (@112canarias) October 25, 2021

Karymsky (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.

Suwanose-jima (Ryukyu Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 13000 ft (4000 m) altitude or flight level 130 and is moving at 10 kts in E direction.
The full report is as follows: VA CONTINUOUSLY OBS IN SATELLITE IMAGERY OBS VA DTG:26/1120Z to 13000 ft (4000 m)

Lewotolo (Lesser Sunda Islands): (25 Oct) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: GROUND REPORT OF DISCRETE ERUPTION WITH VA TO FL120

Krakatau (Sunda Strait, Indonesia): (26 Oct) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: GROUND REPORT OF ERUPTION WITH VA TO 2101 FT

Semisopochnoi (United States, Aleutian Islands): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NOT PROVIDED

Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 16000 ft (4900 m) altitude or flight level 160 and is moving at 15 kts in W direction.
The full report is as follows: CONTG CONS VA EMS. to 16000 ft (4900 m)

Nevado del Ruiz (Colombia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 19000 ft (5800 m) altitude or flight level 190 .
The full report is as follows: VA EMS OBSD to 19000 ft (5800 m)

Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 16000 ft (4900 m) altitude or flight level 160 .
The full report is as follows: VA EMS OBSD to 16000 ft (4900 m)

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 and is moving at 10 kts in SE direction.
The full report is as follows: SPORADIC PUFF EMISSION to 24000 ft (7300 m)