WHY US AND OTHER WESTERN POWERS RESENT NUCLEAR TESTS BY NORTH KOREA?

Western powers have monopolized the nuclear power and weapons. Russia and US hold 92% of the resources. Treaties like CTBT discriminate against the rest of the countries who want to use nuclear resources even for peaceful purposes. India has not signed this treaty. Supply of nuclear materials is controlled by Nuclear Supplies Group (NSG) which is largely controlled by US and Russia and puts discriminatory conditions on developing nations.This is why they are bitterly opposing nuclear tests by North Korea who is not toeing to their line.
Here are statistics

No. of nuclear tests:

US: 1030

USSR Russia: 715

France: 210

UK: 45

China: 45

North Korea: 6

India: 3

Pakistan: 2

Nuclear Inventory

Russia: 7000

US: 6800

France: 300

China: 270

UK: 215

Pakistan: 125

India: 115

Israel: 80

Nobel Prizes: USA far ahead in tally

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There is no doubt that USA laps up the talent from all over the world. US leads the tally of Nobel prize winners which were introduced in 1901 and Economics prize introduced in 1968. Since then 585 Nobel prizes have been awarded to 922 winners out of which only 49 are women.
Youngest and oldest

Youngest person to receive the Nobel is Malala Yousafzai who received it at the age of 17 years in 2014. Although she belongs to Pakistan, her country may hardly be happy over her winning it. Oldest Nobel laureate is Leonid Hurwicz of US who received the Nobel in 2004 for economics at the age of 90 years.
Countries at the top of list.
USA:

357 total

Chemistry: 73

Economics: 55

Literature: 12

Peace: 22

Physics: 94

Medicine: 101
U.K.

115 total

Chemistry: 29

Economics: 10

Literature: 9

Peace: 9

Physics: 26

Medicine: 32
Germany

82 total

Chemistry: 29

Economics: 8

Literature: 1

Peace: 4

Physics: 23

Medicine: 17
France

57 total

Chemistry: 8

Economics: 2

Literature: 15

Peace: 8

Physics: 13

Medicine: 11
Sweden

33 total

Chemistry: 5

Economics: 2

Literature: 9

Peace: 5

Physics: 4

Medicine: 8
Major areas of research leading to Nobel 

In physics is particle physics and in chemistry is biochemistry. Research in genetics most hot topic and in economics it is micro economics.
Nobel winners of Indian origin 
Ronald Ross: Medicine 1902

Rabindranath Tagore: Literature 1913

C.V.Raman: Physics in 1930

Hargobind Khurana: Medicine in 1968

Mother Teresa: Peace in 1979

Subramanyan Chandrasekhar: Physics in 1983

Amartya Sen: Economics in 1998

Venkatraman Ramakrishnan: Chemistry in 2009

Kailash Satyarthi: Peace in 2014