You can use str.extract:
df[0].str.extract('^([^\.]+)')
Output:
0
1 France
2 France
3 Germany
4 Germany
5 Germany
6 Spain
7 Spain
8 Spain
175 France
176 France
177 Germany
178 Germany
179 Germany
180 UK
181 UK
182 UK
183 Italy
184 Italy
185 Italy
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