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Starts only with towing a 1986 Nissan Micra.

Hello, I am writing for the first time on forums of similar formats.
In general, there is a "small" problem with the machine.
We have a 1986 Nissan Micra, 3 doors and 1.0.
The essence of the problem:
There is a spark, there is gas. The car does not start in the cold, but after towing it starts without problems, the next day everything is the same!
We can’t understand what the problem is.
I hope you help us with this problem!
Could be a bad battery under load?

Starter motor seems to be working, but once fully cold it doesn't have enough amps to get it going. In this case you would see spark, but the energy of the spark may not be enough causing misfires in non-ideal start condition and the starter motor may not be able to crank without enough power to get the engine going

Diagnosis would be carbon pile load tester, and spark energy tester
K10 tow starting suggests "stale petrol" & or insufficient voltage during starting as well as corroded dirty electrical connections at 34 years old (1986) in addition to a discharged battery? Should be 12V/13V fully charged.

Check & clean ignition fuses, battery/starter, & main earth chassis engine block connections.

Does it have electronic or breaker point’s ignition?

Happy inspection testing fault finding. ;)

Reference; https://www.google.com/search?client=firefox-b-d&q=stale+petrol+symptoms