[Python] geopandas map centering with countries

I am plotting data for ex-USSR on geopandas and it really does not look nice.



I tried this code published early on 1, 2, but adds no help hence I don't need just map, I need to put data on it. And because I'm merging the 'world' (actually consisting only of ex-USSR countries) and coronavirus data "on 'Country'", then I need that dataframe with original country and adjusted polygons.

Key pieces of my code:

url = "https://opendata.arcgis.com/datasets/a21fdb46d23e4ef896f31475217cbb08_1.geojson"
world = gpd.read_file(url)
ex_ussr = ['Ukraine', 'Belarus', 'Kyrgyzstan', 'Azerbaijan', 'Tajikistan', 'Armenia', 'Georgia', 'Russia', 'Kazakhstan', 'Lithuania', 'Latvia', 'Estonia', 'Uzbekistan']
world = world[world['CNTRY_NAME'].isin(ex_ussr)]
df_world = pd.merge(df_covid, world, on='Country')
crs = {'init': 'epsg:4326'}
corona_gpd = gpd.GeoDataFrame(df_world, crs=crs, geometry='geometry')
f, ax = plt.subplots(1, 1, figsize=(30,5))
ax = corona_gpd.plot(column='New cases', cmap='rainbow', ax=ax, legend=True, legend_kwds={'label': 'New Cases by Country'})

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