Velocity Script returns the wrong values

Three danger zones are apparent here:

1. You must emit a fully-formed <a> element from Velocity, but you are just including the opening tag.
2. Nested #defines are not supported (actually, a single #define isn't supported for URLs, but it usually works)
3. The code is longer than it needs to be, making debugging more difficult.

I shortened and simplified your code and remedied the above problems. Try this:

## Add Article1 URL for the following languages :
#set( $Url = {
  "English" : "URL1",
  "Arabic" : "URL2",
  "Russian" : "URL3",
  "Spanish" : "URL4",
  "Chinese" : "URL5",
  "Japanese" : "URL6",
  "Korean" : "URL7",
  "Vietnamese" : "URL8",
  "India" : "URL9",
  "Ukraine" : "URL10"
})
##--------------------------------------------------------------------------
## Edit the Month and Year in the UTM's (where it says ##EDIT-ME!!##) :
#set( $ArticleUtmCampaign = "utm_campaign=Monthly_NL_January2018_leads" )
#set( $ArticleUtmCampaignIndia = "utm_campaign=Monthly_NL_January2018_India_leads" )
##--------------------------------------------------------------------------
## No Need To Edit Below Here!!!!!!!
##
## Do not edit this param :
#define( $Article1Link )
<a href="http://${ArticleUrl}?utm_source=email&utm_medium=marketo&${ArticleUtmCampaign}" 
   style="text-transform: capitalize; text-decoration:none;background:none;color:white;font-family:'Open Sans',Arial, Helvetica, sans-serif;font-size:16px;font-weight:normal;line-height:120%;text-transform:uppercase;margin:0px;" 
   target="_blank" 
   name="article1">Click to read article</a>
#end
##--------------------------------------------------------------------------
#if ( $lead.Country == "India")
#set( $ArticleUrl = $Url["India"] )
#set( $ArticleUtmCampaign = $ArticleUtmCampaignIndia )
#elseif ( $Url.containsKey($lead.Segmentation_Language_1014) )
#set( $ArticleUrl = $Url[$lead.Segmentation_Language_1014] )
#else
#set( $ArticleUrl = $Url["English"] )
#end
${Article1Link}